Solution of Codechef - May Challenge 2014 - Chef Jumping in C

"He who is fixed to a star does not change his mind." -Leonardo da Vinci
I found this problem at http://www.codechef.com/MAY14/problems/OJUMPS .

Solution:-
#include <stdio.h>

int main(){
    long long a;//i;
    int flag=0,r;
    char yes[]="yes",no[]="no";
    
    fscanf(stdin,"%lld", &a);
    r=a % 6;
    flag=(r==0 || r==1 || r==3)? 1 : 0;
    if(flag){
         fprintf(stdout,"%s",yes);
    }else{
         fprintf(stdout,"%s",no);
    }
    return 0;
}

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