import sys
import math
line = [int(x) for x in sys.stdin.readline().split()]

target = line[0]*0.01*line[2]
soln = target - line[1]
if soln - int(soln) > 0.0001:
    print int(soln) + 1
else:
    if int(soln) > 0:
        print int(soln)
    else:
        print 0
