please help me solve the problem on SPOJ

https://www.spoj.pl/problems/BISHOPS/


The logic of the problem is very easy i.e. 2*n-2
but i am getting WA bcoz i am not able to deal with the large inputs.[?]
plz help me how to get this AC.........


#include<stdio.h>
int main()
{
    long long int n,bmax;
    while(scanf("%lld",&n)!=EOF)
    {
        if(n==1)
        printf("%d\n",1);
        else
        {
        bmax=(2*n)-2;
        printf("%lld\n",bmax);

        }
    }
return 0;
}

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