#include <bits/stdc++.h>
using namespace std;
long long Gcd(long long a, long long b) {
  if (b == 0) return a;
  return Gcd(b, a % b);
}
int Min(int a, int b, int c) {
  a = a < b ? a : b;
  a = a < c ? a : c;
  return a;
}
int main() {
  float n, x, y, wiz, p, ans;
  cin >> n >> x >> y;
  p = y / 100.0;
  wiz = ceil(n * p);
  ans = wiz - x;
  if (ans > -1) {
    cout << ans << endl;
  } else {
    cout << 0 << endl;
  }
  return 0;
}
