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#include <iostream>
#include <fstream>
using namespace std;
fstream f("podm.in");
ofstream g("podm.out");
int main()
{
int n,v[501],i,j,m[501][501],l,k;
f >> n;
for(i=0;i<=n;i++)
{
f >> v[i];
}
for(l=2;l<=n;l++)
{
for(i=1;i<=n-l+1;i++)
{
j=i+l-1;
m[i][j]=2147000000;
for(k=i;k<j;k++)
{
m[i][j]=min(m[i][j],m[i][k]+m[k+1][j]+v[i-1]*v[k]*v[j]);
}
}
}
g << m[1][n];
}