#include <bits/stdc++.h>
int main() {
  int n, m, k;
  float proc;
  int need;
  scanf("%d%d%d", &n, &m, &k);
  proc = (n * k / 100);
  need = floor(proc);
  if (m % 2 != 0) need++;
  printf("%d", need - m);
  return 0;
}
