President Hu Jintao set out four specific expectations for Leung Chun-ying on the new chief executive's first day in office - as tens of thousands of Hongkongers joined the city's biggest protest march in years. Hu made his unusually specific calls at Leung's inauguration ceremony in the morning, telling the new leader that his government must promote social harmony and stability, uphold the authority of the Basic Law, enhance the city's competitiveness and nurture political talents who could 'inherit the traditions of patriotism and succeed in the business of 'one country, two systems'.' In a later meeting with Leung and his new cabinet, the president demanded that Leung run a 'clean and effective' government, while Leung promised to safeguard the city's core values, including the rule of law, freedom, democracy and protecting the rights enshrined in the city's mini-constitution. But as Leung and Hu met, tens of thousands of protesters were gathering in Victoria Park to express a range of grievances, from anger at the slow pace of democratisation to concern about human rights on the mainland. Many called for Leung to quit on his first day in office after the discovery of illegal structures at his home raised questions about his integrity. Rally organiser Eric Lai Yan-ho, of the Civil Human Rights Front, put the turnout at 400,000, while police say 55,000 people started the march in the park, with the total peaking at 63,000. The last protesters were only able to leave the park at 7pm, some four hours after the march was due to begin. Some took as long as six hours to reach government headquarters in Admiralty. A minority of the protesters continued to the central government's liaison office, where they were involved in a tense stand-off with police before dispersing at 11.30pm. Lai said the huge turnout, reminiscent of the massive rallies of 2003 and 2004, showed Hongkongers had no faith in Leung. Paul Yip Siu-fai, a University of Hong Kong, statistician, estimated the turnout at between 70,000 and 90,000 based on an on-site count. The University of Hong Kong's public opinion programme put the figure at between 98,000 and 112,000. Dr Ray Yep Kin-man, an associate professor of politics at City University said the turnout was higher than expected, and said a desire to protest against the central government, as well as the city's leaders, was motivating a growing number of marchers. Leung said last night that his team would begin hitting the streets today in an effort to 'listen to people's views and aspirations and work together with them to address deep-rooted problems in a pragmatic manner.' Leung will visit Shau Kei Wan this afternoon and head to Tuen Mun in the evening. He plans to visit all 18 districts of the city in his first few weeks in office. Twice during his three-day visit Hu called for Hongkongers to unite in support of Leung's administration. 'Hong Kong people from all walks of life should take the overall situation into consideration to achieve unity under the flag of patriotism,' Hu said yesterday. He said it would be important to uphold the principle of 'one country, two systems' and a high degree of autonomy for the city in order to 'guard against the intervention of external forces'. A ring of security surrounded Hu during his visit, but one protester, Tsang Kin-chiu, was briefly able to chant slogans calling for the vindication of the Tiananmen Square democracy movement and the end of one-party rule at the inauguration ceremony Veteran China commentator Johnny Lau Yui-siu says Beijing is concerned by infighting in the pro-government camp between Leung's supporters and those who backed Henry Tang Ying-yen. 'They do not want to see further infighting ... which shows no sign of abating after the chief executive election,' Lau said. 'To Beijing it is a new problem established on top on the chronic struggles between the civil society and the government and business.'