#include <bits/stdc++.h>
using namespace std;
int main() {
  long long i, j, x, y, n, ans;
  float a, b, c, need, cnt;
  while (cin >> a >> b >> c) {
    need = c / 100;
    cnt = ceil(a * need);
    cnt = cnt - b;
    cout << max(0, int(cnt)) << endl;
  }
  return 0;
}
