#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

long sumOfGroup(long k) {
    // Return the sum of the elements of the k'th group.
    if(k == 1)
        return 1;
    else{
        if(k % 2 == 0)
            return ((k+1) + (k+3) );
        else
            return ((k + 4) + (k + 6) + (k + 8));
        }
}

int main() {
    long k; 
    scanf("%ld", &k);
    long answer = sumOfGroup(k);
    printf("%ld\n", answer);
    return 0;
}