Which three Allied powers had representatives attend and agree to the provisions of the Potsdam Conference?

At the end of WWII, the Potsdam Conference was held from July 17 until August 2, 1945 between the three Allied powers including the Soviet Union, the United Kingdom and the United States. The leading representatives who attended and agreed to the provisions were Premier Joseph Stalin for the Soviet Union, Prime Ministers Winston Churchill and Clement Attlee for the United Kingdom, and the U.S. President Harry S. Truman.

They gathered to decide how to administer Germany which had agreed to an unconditional surrender 9 weeks earlier on the 8th of May. Additionally, the goals of the conference were to establish a postwar order, peace treaty issues and countering the devastation of the war.

France had been excluded from the conference and therefore resisted implementing the Potsdam Agreement within its occupation zone. In particular, the French refused to resettle any Germans expelled from the east, plus France refused to abide by the Potsdam Agreement reserving the right to block any proposals to establish common policies and institutions across Germany as a whole and anything that could lead to the eventual emergence of an unified German government.