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#include <bits/stdc++.h>
#define Int long long
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
Int n,i,L,R,M,d[510],sol[510][510];
int main()
{
f>>n;
for(i=0; i<=n; i++)
f>>d[i];
for(i=2; i<=n; i++)
for(L=0,R=i; R<=n; L++,R++)
{
sol[L][R]=sol[L][L+1]+sol[L+1][R]+d[L]*d[L+1]*d[R];
for(M=L+1; M<R; M++)
sol[L][R]=min(sol[L][R],sol[L][M]+sol[M][R]+d[L]*d[M]*d[R]);
}
g<<sol[0][n];
return 0;
}