#include <bits/stdc++.h>
using namespace std;
const int MAXN = 10000;
int main() {
  long long n, x, y, k;
  cin >> n >> x >> y;
  k = y * n - 100 * x;
  k = ceil((long double)((long double)k / (long double)100.0));
  for (k = (k - MAXN); true; k++) {
    if (100 * k >= (y * n - 100 * x)) break;
  }
  cout << k << endl;
  return 0;
}
