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#include <fstream>
#include <vector>
#include <cmath>
using namespace std;
ifstream f ("podm.in");
ofstream t ("podm.out");
int64_t v[510],d[510][510];
int main()
{
int n;
f>>n;
for(int i=1;i<=n+1;++i)
f>>v[i];
for(int e=2;e<=n;++e)
for(int i=1,j=e;j<=n;i++,++j)
{
d[i][j]=INFINITY;
for(int k=i;k<j;++k)
d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]+v[i]*v[k+1]*v[j+1]);
}
t<<d[1][n];
return 0;
}