Viral Advertising Hacker Rank solution in C

 #include<stdio.h>

#include<math.h>

int main()

{

    int n;

    scanf("%d",&n);

    int liked=2,ans=2,shared;

    for(int i=2;i<=n;i++)

    {

        shared = liked *3;

        liked = floor(shared/2.0);

        ans=ans+liked;

    }

    printf("%d",ans);

}