#!/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()

for p in range(100000):
    if (x + p) * 100  >= y * n: print p; break
