WA in TSHOW2....help!

[sid_iiita]

#include <stdio.h>
int main()
{
    int t,i;
    unsigned long long int j,n,a,b,c;
    scanf("%d",&t);
    for(i=0;i<t;i++){
    scanf("%llu",&n);
    n = n%60;

    if(n==1){
        printf("0\n");
    }else if(n==2){
        printf("1\n");
    }else{
        a = 0;
        b = 1;
        for(j=3;j<=n;j++){
            c = (a+b)%10;
            a = b;
            b = c;
        }
        printf("%llu\n",c);
    }
}
return 0;
}