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Instead, the figures were released on the first day of official meetings by House and Senate negotiators who have been tasked with writing the first overall budget blueprint since 2009.

Mr. Obama has called for lawmakers to strike a grand bargain that would raise taxes and cut entitlements, using some of the money to replace the budget sequesters and the rest to reduce the deficit in future years.

But liberal advocacy groups have said they will lobby against any effort to constrain the growth of Social Security or other entitlement benefits, and Republicans have ruled out tax increases, leaving narrow room for a deal.

“If we look at this conference as an argument about taxes, we’re not going to get anywhere,” said Rep. Paul Ryan of Wisconsin, the House Republicans’ chief budget negotiator. “The way to raise revenue from our perspective is to grow the economy, to get people back to work.”

Sen. Patty Murray, Washington Democrat and chairwoman of the Senate Budget Committee, said the modest goal of the negotiations should be to set a spending number for fiscal 2014, which began a month ago, and to come up with ways to alter the budget sequesters.

“This won’t be easy,” she said. “The House and Senate budgets are very different even for just this year, but if both sides are willing to move out of their partisan corners and offer up some compromises, I’m confident it can be done.”

The next round of budget sequesters, due to bite Jan. 15, will hit defense spending particularly hard.

That comes on top of the cuts for fiscal year 2013, in which defense spending dropped to $635.2 billion, down from a high of $708.3 billion in 2011.

Indeed, discretionary spending — the annual spending Congress has to approve each year — dropped, while entitlements such as Social Security, Medicare and veterans’ benefits grew.