#include <bits/stdc++.h>
using namespace std;
const double PI = acos(-1.0);
const int INF = 1000000000;
const int MOD = 1000000007;
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  int k = y * n - 100 * x;
  if (k < 0) {
    cout << 0;
  }
  if (k % 100 == 0) {
    cout << k / 100;
  } else {
    cout << k / 100 + 1;
  }
  return 0;
}
