#include<cstdio>   #include<iostream>   #include<cstring>   #include<string>   #include<cmath>   #include<map>   #include<algorithm>   #include<vector>   #include<set>   #define Quick ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)   #define ll long long   #define INF 0x3f3f3f3f   #define PI acos(-1)   #define mem(a, b) memset(a, b, sizeof a)   using namespace std;   const int N = 1e6 + 3;   const int mod =1e9 + 7;    int a[N];   ll dp[N];   int vis[N];   int tot = 0;      int main()   {    Quick;    int n; cin >> n;    cout << (n - 1) % 9 + 1 << endl;;   }      