#include <bits/stdc++.h>   using namespace std;   long long int MOD = 1e9 + 7;   long long int INF = 1e18;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long int i, j, k = 0, m = 0, n, p = 0, l, r, ans = 0, cnt = 0,                         mini = INF, maxi = INF, x, y, a, b, c, low, mid, high, h,                         q, k1, l1, t;     cin >> n >> m;     long long int A[m][n + 1];     long long int B[m][n + 1];     for (j = 0; j < m; j++) {       for (i = 1; i <= n; i++) {         cin >> k;         A[j][i] = k;         B[j][k] = i;       }     }     ans = n;     h = 1;     for (i = 1; i < n; i++) {       j = 0;       l = A[j][i];       r = A[j][i + 1];       p = 0;       for (j = 1; j < m; j++) {         if ((B[j][r] - B[j][l]) != 1) {           h = 1;           p = 1;           break;         }       }       if (p == 0) {         h++;         ans = ans + (h - 1);       }     }     cout << ans << endl;   }   