Codeforces Pizza, Pizza, Pizza!!! 979A

A solution in c++

#include<bits/stdc++.h>

using namespace std;

/// Typedef

typedef long long int ll;

//Int data type

#define sc1(a)              scanf("%d", &a)

#define sc2(a, b)           scanf("%d %d", &a, &b)

#define sc3(a, b, c)        scanf("%d %d %d", &a, &b, &c)

#define sc4(a, b, c, d)     scanf("%d %d %d %d", &a, &b, &c, &d)

//Long Data type

#define scl1(a)             scanf("%lld", &a)

#define scl2(a, b)          scanf("%lld %lld", &a, &b)

#define scl3(a, b, c)       scanf("%lld %lld %lld", &a, &b, &c)

#define scl4(a, b, c, d)    scanf("%lld %lld %lld %lld", &a, &b, &c, &d)

int main()

{

   ll a=0,b=0,c=0,n,ln,i,j,ck=0;

   scl1(n);

   if(n==0){

     printf("0\n");

     return 0;

   }

   if((n+1)%2==0)

    printf("%lld\n", (n+1)/2);

   else{

    printf("%lld\n", n+1);

   }

}