#include <bits/stdc++.h>
int main() {
  int n, x, y, a, clone;
  float p1;
  scanf("%d %d %d", &n, &x, &y);
  p1 = (x / n) * 100;
  if (p1 < y) {
    a = (n * y);
    if (a % 100 == 0)
      a = a / 100;
    else
      a = (a / 100) + 1;
    clone = a - x;
  } else
    clone = 0;
  printf("%d", clone);
  return 0;
}
