#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, t = 0, y;
  cin >> n >> x >> y;
  while (1) {
    float pp = 100.0 * (x + t) / n;
    if (pp + 1e-5 >= y) break;
    t++;
  }
  cout << t << endl;
  return 0;
}
