Article: In January 2009 President Barack Obama restored US funding to UNFPA, saying in a public statement that he would "look forward to working with Congress to restore US financial support for the UN Population Fund. By resuming funding to UNFPA, the US will be joining 180 other donor nations working collaboratively to reduce poverty, improve the health of women and children, prevent HIV/AIDS and provide family planning assistance to women in 154 countries." 

Question: The president said the U.S. would be joining how many donor nations?
180