#include <bits/stdc++.h>
using namespace std;
double n, m, k, l, o, i;
double a, b, c, d, e, f;
int main() {
  scanf("%lf%lf%lf", &n, &m, &k);
  a = k / 100;
  d = a * n;
  if (d != int(d)) d = d + 0.1;
  o = d;
  if (d - m < 0) {
    puts("0");
  }
  printf("%.0lf\n", d - m);
  return 0;
}
