Bloomberg have compiled the figures, and say Greece needs to refinance or repay about 6.5bn EUR in debt & interest in the next 3 weeks

In addition:

its budget forecasts a 2.1 billion cash deficit in March

A shortfall in tax revenue already opened a cash hole of 217 million euros in January, derailing budget targets

Says the deadlock with Europe threatens to "pull the country back into a recession this quarter, or even a possible default within weeks"

More at the article, here (not gated)