With the Greek economy on the brink of collapse, food and medicine have begun to run low and banks say they have barely enough money to make it through the weekend. Banks say they have 1 billion euros left, or just 90 euros a head for the country’s 11 million people, until Sunday’s referendum, when the country will decide whether to accept an austerity deal. Food staples such as sugar and flour are running out, along with vital drugs in pharmacies. Prime Minister Alexis Tsipras is urging Greeks to vote “no” in the referendum and give him the chance to negotiate a better deal. “I urge you to say no to ultimatums, blackmail and fear. To say no to being divided,” Tsipras said.