#include <cstdio>
#include <iostream>
#include <cstring>

using namespace std;

const int nmx = 502;
const int inf = 0x3f3f3f3f;

int n;
long long mat[nmx][nmx],v[nmx];

int main()
{
    freopen("podm.in", "r", stdin);
    freopen("podm.out", "w", stdout);

    memset(mat,inf,sizeof(mat));

    scanf("%d", &n);
    for(int i = 0; i <= n; ++i)
        scanf("%lld", &v[i]);

    for(int i = 1; i < n; ++i)
        mat[i][i+1] = v[i-1]*v[i]*v[i+1];

    for(int i = 1; i <= n; ++i)
        mat[i][i] = 0;

    for(int d = 2; d < n; ++d)
        for(int i = 1; i <= n - d; ++i)
            for(int k = i; k < i + d; ++k)
                mat[i][i+d] = min(mat[i][i+d],mat[i][k] + mat[k+1][i+d] + v[i-1]*v[k]*v[i+d]);

    printf("%lld\n", mat[1][n]);

    return 0;
}