#include <bits/stdc++.h>
int main() {
  long long a, b = 1, c, d, i, j;
  double e, f;
  while (scanf("%lld", &a) == 1) {
    if (a == 1)
      printf("5\n");
    else
      printf("25\n");
  }
  return 0;
}
