#!/usr/bin/python

from collections import deque
from collections import Counter

def ir():
    return int(raw_input())

def ia():
    line = raw_input()
    line = line.split()
    return map(int, line)

n, x, y = ia()

lo, hi = 0, 100000000

for i in range(100):
    mi = (lo + hi) // 2
    if (x + mi) * 100  > y * n: hi = mi
    else                      : lo = mi

print mi
