**lucky**if it is a sum of positive integers (not necessarily distinct) whose reciprocals sum to 1. For example, 4 and 11 are lucky: 4=2+2 and 1/2+1/2=1, and 11=2+3+6 and 1/2+1/3+1/6=1. But 2, 3, and 5 are unlucky. How many unlucky positive integers are there?