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#include<fstream>
#include<climits>
using namespace std;
#define MAX 505
#define MaxV 1000000000000000000;
int dim[MAX];
long long m[MAX][MAX];
int main(){
ifstream in("podm.in");
int n,i;
in>>n;
for(i=0;i<n+1;i++) in>>dim[i];
in.close();
for(i=1;i<n;i++) m[i][i+1]=dim[i-1]*dim[i]*dim[i+1];
for(int d=2;d<n;d++)
for(i=1;i<=n-d;i++){
long long minV=MaxV;
for(int k=i; k<i+d; k++){
long long aux=m[i][k]+m[k+1][i+d]+dim[i-1]*dim[k]*dim[i+d];
if(minV>aux) minV=aux;
}
m[i][i+d]=minV;
}
freopen("podm.out","w",stdout);
printf("%lld",m[1][n]);
return 0;
}