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#include <bits/stdc++.h>
using namespace std;
ifstream in("podm.in");
ofstream out("podm.out");
unsigned long long n, v[501], ans[501][501];
int main()
{
in >> n;
for(int i = 0; i <= n; i++) {
in >> v[i];
}
for(int i = 1; i <= n; i++) {
for(int j = i + 1; j <= n; j++) {
ans[i][j] = ULLONG_MAX;
}
}
for(int i = 0; i <= n - 1; i++) {
for(int j = 1; i + j <= n; j++) {
for(int k = j; k <= i + j; k++) {
ans[j][i + j] = min(ans[j][i + j], ans[j][k] + ans[k + 1][i + j] + v[j - 1] * v[i + j] * v[k]);
}
}
}
out << ans[1][n];
return 0;
}