#!/bin/python3

import sys

def sumOfGroup(k):
    n=1
    i=1
    c=1
    while(n<pow(10,k)):
        p=0
        sum=0
        while p<c:
            sum=sum+i
            p=p+1
            i=i+2
        if c==k:
            return sum
            break;
        c=c+1
        n=n+1
        
            
            
    
    # Return the sum of the elements of the k'th group.

if __name__ == "__main__":
    k = int(input().strip())
    answer = sumOfGroup(k)
    print(answer)