/* -*- coding: utf-8 -*-
 *
 * 928.cc:  No.928 軽減税率? - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_X = 1000000000;

/* typedef */

typedef long long ll;

/* global variables */

/* subroutines */

inline ll f(int p, int x, int a = 0) {
  return (ll)(100 + p) * x / 100 + a;
}

/* main */

/*
  yp = (100+p)/100*x
  yq = (100+q)/100*x+a
  yp < yq -> (100+p)x < (100+q)x+100a
  -> (p-q)x < 100a -> x < 100a/(p-q)
 */

int main() {
  int p, q, a;
  scanf("%d%d%d", &p, &q, &a);

  int cnt = 0;
  int maxx = 100 * (a + 1);
  for (int x = 1; x <= maxx; x++)
    if (f(p, x) < f(q, x, a)) cnt++;

  if (f(p, MAX_X) < f(q, MAX_X + a))
    cnt += MAX_X - maxx;

  printf("%d\n", cnt);
  return 0;
}