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#include <cstdio>
#include <algorithm>
using namespace std;
#define MAXN 505
#define INF 0x3f3f3f3f
long long dst[MAXN],dp[MAXN+5][MAXN];
int n;
long long mn_dp(int i, int j)// le dinamique
{
if(i==j)
return 0;
if(dp[i][j])
return dp[i][j];
dp[i][j]=INF;
for(int k=i; k<j; k++)
dp[i][j]=min(dp[i][j], mn_dp(i,k) + mn_dp(k+1,j) + dst[i-1]*dst[k]*dst[j]);
return dp[i][j];
}
int main()
{
freopen("podm.in","r",stdin);
freopen("podm.out","w",stdout);
scanf("%d",&n);
for(int i=0; i<=n; i++)
scanf("%d",&dst[i]);
printf("%d",mn_dp(1,n));
}