#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  int clones = (n * y + 99) / 100 - x;
  if (clones < 0) {
    clones = 0;
  }
  cout << clones << endl;
  return 0;
}
