View Code of Problem 20

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include<math.h>
int main() {//65-90 97-122
	int n;
	while(scanf("%d",&n) !=EOF)
	if (n % 3 == 0) {
		printf("NO\n");
	}
	else {
		printf("YES\n");
	}
	return 0;
}

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