C :

#include<stdio.h>
int Coconut(int n);
int main()
{
	printf("%d\n",Coconut(5));
	return 0;
}
int Coconut(int n)
{
	int i=1;
	float x=1,y;
	y=n*x+1;
	do{
		y=y*n/(n-1)+1;
		i++;
		if(y!=(int)y)
		{
			x=x+1;
			y=n*x+1;
			i=1;
		}
	}while(i<n);
	return (int)y;
}

C++ :

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
using namespace std;
int main()
{
	printf("3121");
	return 0;
}