#include <algorithm>
#include <cstdio>
using namespace std;

inline int next_int() {
	int d;
	scanf("%d", &d);
	return d;
}

bool seen[501][501];
long long A[501], dp[501][501];

long long f(int a, int b) {
	if (a == b) {
		return 0;
	}
	if (seen[a][b]) {
		return dp[a][b];
	}
	seen[a][b] = true;
	dp[a][b] = 1e18;
	for (int i = a; i < b; i++) {
		dp[a][b] = min(dp[a][b], A[a] * A[i + 1] * A[b + 1] + f(a, i) + f(i + 1, b));
	}
	return dp[a][b];
}

int main() {
	freopen("podm.in", "r", stdin);
	freopen("podm.out", "w", stdout);
	int n = next_int();
	for (int i = 0; i <= n; i++) {
		A[i] = next_int();
	}
	printf("%lld", f(0, n - 1));
	return 0;
}