HDU 5585 Numbers

#include<cstdio>
#include<cstring>

char s[1000];

int main()
{
    while(~scanf("%s",s)){
    int len=strlen(s);

    int flag=0;

    if((s[len-1]-‘0‘)%2==0) flag=1;

    if((s[len-1]-‘0‘)==0||(s[len-1]-‘0‘)==5) flag=1;

    int sum=0;
    for(int i=0;s[i];i++)
        sum=sum+s[i]-‘0‘;

    if(sum%3==0) flag=1;

    if(flag ) printf("YES\n");
    else printf("NO\n");
    }
    return 0;
}