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20 lines
410 B
20 lines
410 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 1e4 + 10;
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int f[N];
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int a[N][N];
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int main() {
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int n;
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cin >> n;
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for (int i = 1; i <= n; i++)
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for (int j = 1; j <= i; j++)
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cin >> a[i][j];
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for (int i = n; i >= 1; i--)
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for (int j = 1; j <= i; j++)
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f[j] = max(f[j + 1], f[j]) + a[i][j];
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printf("%d", f[1]);
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return 0;
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}
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