#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <deque>
#include <atcoder/modint>

using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

const i64 INF = 1001001001001001001;
using Modint = atcoder::static_modint<998244353>;

int main(){
    int N, M; cin >> N >> M;
    vector<i64> dp(M, 0);
    vector<i64> A(M, 0);
    rep(i,N){
        rep(j,M) cin >> A[j];
        rep(j,M) dp[j] += A[j];
        i64 mdp = *min_element(dp.begin(), dp.end());
        rep(j,M) dp[j] = min(dp[j], mdp + A[j]);
    }
    i64 ans = *min_element(dp.begin(), dp.end());
    if(N == 1) ans = 0;
    cout << ans << '\n';
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;