func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mod = 1e9 + 7;   int main() {     int t;     int n, m;     long long s = 0;     cin >> n >> m;     vector<long long> a(m);     for (int i = 0; i < m; i++) {       cin >> a[i];     }     s += (a[0] - 1);     for (int i = 1; i < m; i++) {       if (a[i] >= a[i - 1]) {         s += (a[i] - a[i - 1]);       } else {         s += (n - a[i - 1]);         s += (a[i]);       }     }     cout << s << endl;   }   