#include <bits/stdc++.h>
const int maxn = 2e5 + 10;
const int mod = 1e8 + 7;
using namespace std;
void init() {}
double n, x, y;
int main() {
  cin >> n >> x >> y;
  double ans = n * y / 100;
  if (ans != (int)ans) ans = (int)ans + 1;
  cout << ans - x;
  return 0;
}
