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#include <cstdio>
#include <algorithm>
using namespace std;
long long n, d[505];
long long dp[505][505];
int main()
{
freopen("podm.in", "r", stdin);
freopen("podm.out", "w", stdout);
scanf("%lld", &n);
for(int i=0; i<=n; i++)
scanf("%lld", &d[i]);
for(int dif=1; dif<n; dif++)
{
for(int i=1; i<=n; i++)
{
long long vmin=999999999;
int j=i+dif;
for(int k=i; k<=j-1; k++)
vmin=min(vmin, (dp[i][k]+dp[k+1][j]+d[i-1]*d[k]*d[j]));
dp[i][j]=vmin;
}
}
printf("%lld", dp[1][n]);
return 0;
}