#include using namespace std;
int n,m;
int a[105][105];
int main(){ cin >> n >> m; for (int i=1;i<=n;i++) for (int j=1;j<=m;j++) cin >> a[i][j];
int ans=0; for (int i=1;i<=n;i++) for (int j=1;j<=m;j++) if (i==1||i==n||j==1||j==m) ans += a[i][j]; cout << ans << endl;
}
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BC20260080
LV 9
@ 1 year ago
