x, y, z = map(float, raw_input().split())
percentagething = z * 0.01
populationthatcomes = x * percentagething
counter = 0
if y >= populationthatcomes:
    print 0
    exit()
else:
    while y < populationthatcomes:
        y += 1
        counter += 1
        if y >= populationthatcomes:
            print counter
            exit()

