fila.cpp

#include <iostream>
#include <vector>
#include <map>
#include <queue>
#include <string>
#include <string.h> // memset
#include <algorithm> // lower_bound
#include <iomanip>
#include <bitset>
    // #include <bits/stdc++.h>

using namespace std;

#define fs first
#define sd second
#define pb push_back
#define vii vector<int>
#define pii pair<int, int>
#define MAXN 120000

const int INF = 0x3f3f3f3f;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    long long int n;
    cin >> n;

    if(n > 0 && ((n+1) & (n)) == 0) {
        cout << "S\n";
    } else {
        cout << "N\n";
    }
    return 0;
}