#!/usr/local/bin/tcc -run
#include <stdio.h>

int main( int argc, char* argv[] )
{
	int  a=15;
	scanf("%d", &a);

	if ( (10 <= a) &&	(a <= 20) )
  {
	  printf("%d\n", a);
  }
  else
  {
    printf("over\n");
  }
}