#include <stdio.h>
int func(int num){
	if(num==1){
	num = 2;
	return num;
	}
	if(num==2){
	num = 3;
	return num;
	}
	if(num==3){
	num = 5;
	return num;
	}
	if(num==4){
	num = 7;
	return num;
	}
	if(num==5){
	num = 11;
	return num;
	}
	else
	num = -1;
	return num;
}
	
int main(void){
int num, prime;
scanf("%d", &num);
prime = func(num);
if(prime > 0)
printf("%d番目の素数は%d\n", num,
prime);
else
printf("未対応の値です\n");
return 0;
}