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#include <fstream>
#include <limits.h>
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long d[501][501];
int a[501],i,j,l,k,n;
int main()
{
f>>n;
for(i=0;i<=n;i++)
f>>a[i];
//l=2
for(i=1;i<n;i++)
d[i][i+1]=a[i-1]*a[i]*a[i+1];
for(l=2;l<=n;l++){
for(i=1;i<=n-l+1;i++){
j=i+l-1;
d[i][j]=LLONG_MAX;
for(k=i;k<j;k++)
d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]+a[i-1]*a[k]*a[j]);
}
}
g<<d[1][n];
return 0;
}