ATHENS: Greek Prime Minister Andreas Papandreou resigend his post Monday after two months in the hospital for pneumonia and heart trouble, each day of which created new speculation that he was near death. Under its constitution, the ruling socialist party now has three days to elect a new premier. The top contenders for his post are two economists, Defense Minister Gerasimos Arsenis and former Industry Minister Costas Simitis. The 76-year-old Papandreou, who has been on and off life support, reportedly signed the resignation from his hospital bed in Athens. He did not quit as head of the party.