#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main () {
    int N, M;
    cin >> N >> M;
    ll dp[1010];
    for (int i = 0; i < M; i ++) {
        cin >> dp[i];
    }
    ll A[1010];
    for (int i = 0; i < N-1; i ++) {
        ll mini = (ll)1e18;
        for (int j = 0; j < M; j ++) {
            cin >> A[j];
            mini = min(mini, dp[j] + A[j]);
        }
        for (int j = 0; j < M; j ++) {
            dp[j] = min(mini, dp[j]) + A[j];
        }
    }
    ll ans = (ll)1e18;
    for (int i = 0; i < M; i ++) {
        ans = min(ans, dp[i]);
    }
    cout << ans << endl;
}