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#include <bits/stdc++.h>
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int N;
long long V[501],DP[501][501];
int main()
{
f>>N;
for(int i=0;i<=N; ++i) f>>V[i];
for(int i=1;i<N; ++i)
for(int j=i+1; j<=N; ++j)
{
DP[j-i][j]=1LL<<60;
for(int k=j-i; k<j; ++k)
DP[j-i][j]=min(DP[j-i][j],DP[j-i][k]+DP[k+1][j]+V[j-i-1]*V[k]*V[j]);
}
g<<DP[1][N];
}