#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
int m,n;
vector<vector<int>> space;
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin >> m >> n;
    for(int i=0; i<m; i++) {
        //한줄씩 입력
        vector<int> row(n),tmp(n);
        for(int j=0; j<n; j++) {
            cin >> row[j];
            tmp[j]=row[j];            
        }
        //정렬(좌표압축하려고)
        sort(tmp.begin(),tmp.end());
        tmp.erase(unique(tmp.begin(),tmp.end()),tmp.end());
        //좌표 압축됨
        vector<int> new_space(n);
        for(int k=0; k<n; k++) {
            int x = lower_bound(tmp.begin(),tmp.end(),row[k])-tmp.begin();
            new_space.push_back(x);
        }
        space.push_back(new_space);
    }
    int cnt=0;
    for(int i=0; i<m; i++) {
        for(int j=i+1; j<m; j++) {
            if(space[i]==space[j]) cnt++;
        }
    }
    cout<< cnt;
}

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