/*
* 1021.cpp
*
* Created on: 2010-10-2
* Author: wyiu
*/
#include <cstdio>
#include <cstring>
using namespace std;
int f[1000001];
int main()
{
f[0]=7%3;
f[1]=11%3;
for(int i=2; i<=1000000; i++)
{
f[i] = (f[i-1] + f[i-2]) % 3;
}
int x;
while(scanf("%d", &x) != EOF)
{
if(f[x] == 0)
printf("yes\n");
else printf("no\n");
fflush(stdout);
}
return 0;
}
posted on 2010-10-02 16:48
wyiu 阅读(212)
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