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