#include<bits/stdc++.h>
using namespace std;
 
string multiply(string num1, string num2)
{
    int n1 = num1.size();
    int n2 = num2.size();
    if (n1 == 0 || n2 == 0)
       return "0";
 
    vector<int> result(n1 + n2, 0);
 
    int i_n1 = 0; 
    int i_n2 = 0; 
 
    for (int i=n1-1; i>=0; i--)
    {
        int carry = 0;
        int n1 = num1[i] - '0';
 
        i_n2 = 0; 
         
        for (int j=n2-1; j>=0; j--)
        {
            int n2 = num2[j] - '0';
 
            int sum = n1*n2 + result[i_n1 + i_n2] + carry;
 
            carry = sum/10;
 
            result[i_n1 + i_n2] = sum % 10;
 
            i_n2++;
        }
 
        if (carry > 0)
            result[i_n1 + i_n2] += carry;
 
        i_n1++;
    }
 
    int i = result.size() - 1;
    while (i>=0 && result[i] == 0)
       i--;
 
    if (i == -1)
       return "0";
 
    string s = "";
    while (i >= 0)
        s += std::to_string(result[i--]);
 
    return s;
}
 
int main()
{
    long int k;
    cin>>k ;
    long int m=k*k ;
    string str1 = to_string(k);
    string str2 = to_string(m);
    cout << multiply(str1, str2);
    return 0;
}