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#include <iostream>
#include <fstream>
#define D 1000000000000LL
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long n,m[505][505],v[505];
inline void podm(long long i, long long j)
{
int k;
if(i==j)
return;
if(m[i][j])
return;
m[i][j]=D;
for(k=i;k<j;k++)
{
podm(i,k);
podm(k+1,j);
m[i][j]=min(m[i][j],v[i-1]*v[k]*v[j]+m[i][k]+m[k+1][j]);
}
return;
}
int main()
{
int i,j;
f>>n;
for(i=0;i<=n;i++)
f>>v[i];
podm(1,n);
g<<m[1][n];
}