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#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#define N 502
using namespace std;
long long d[N][N],v[N];
int main(){
int i,n,len,j,k;
freopen("podm.in","r",stdin);
freopen("podm.out","w",stdout);
scanf("%d",&n);
for(i=0;i<=n;i++){
scanf("%lld",&v[i]);
}
for(i=1;i<=n;i++){
d[i][i]=0;
}
for(i=1 ; i<=n-1 ; i++){
d[i][i+1]=v[i-1]*v[i]*v[i+1];
}
for(len=2;len<n;len++){
for(i=1; i+len<=n;i++){
j=i+len;
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]+v[i-1]*v[k]*v[j]);
}
}
}
printf("%lld",d[1][n]);
return 0;
}