#include <bits/stdc++.h>
int main() {
  double n, x, y;
  scanf("%lf %lf %lf", &n, &x, &y);
  double ans;
  int a;
  ans = n * y / 100 - x;
  a = ans;
  if (ans - a > 0) {
    a++;
  }
  printf("%d", a);
  return 0;
}
