Note:
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#include <queue>
#include <math.h>
#include <stack>
#include <vector>
#include <stdio.h>
#include <iostream>
#include <vector>
#include <iomanip>
#include <string.h>
#include <cstring>
#include <algorithm>
#define int long long
using namespace std;
const int N = 1e6 + 10;
const int INF = 0x3f3f3f3f;
int n;
signed main(){
	cin >> n;
	cout << n % 10 << endl;
	return 0;
}