#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(void) {
  char buf[16];
  int len, n;

  len = scanf("%15s", buf);

  if (len > 1) {
    buf[len - 1] = '\0';
  }

  n = atoi(buf);

  printf("%d\n", n * n);
  return 0;
}