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

int main(void){
	int num;
	scanf("%d",&num);
	if(num < 10){
		printf("00%d\n",num);
	}else if(num < 100){
		printf("0%d\n",num);
	}else{
		printf("%d\n",num);
	}
	return 0;
}