#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
const int mod=1000000007;
const int mod1=998244353;
int inf=1000000000;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;cin >> n;
	cout << (n==0?0:n*10) << endl;
}