#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  int z = (n * y + 100) / 100;
  if (z == x) {
    cout << 0 << endl;
  } else {
    cout << z - x << endl;
  }
  return 0;
}
