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#include<fstream>
using namespace std;
int n, v[503], L[503], C[503], i, j, l, k;
long long D[503][503];
long long minim(long long x, long long y){
return x<y?x:y;
}
ifstream in("podm.in");
ofstream out("podm.out");
int main(){
in>>n;
in>>v[1];
for(i=2; i<=n+1; i++){
in>>v[i];
L[i-1]=v[i-1];
C[i-1]=v[i];
}
for(i=1; i<=n; i++)
D[i][i]=0;
for(l=2; l<=n; l++){
for(i=1; i+l-1<=n; i++){//pozitiile de inceput ale secv delungime L
j=i+l-1;
D[i][j]=999999999;
for(k=i; k<j; k++){
D[i][j]=minim(D[i][j], D[i][k]+D[k+1][j]+1LL*L[i]*C[k]*C[j]);
}
}
}
out<<D[1][n];
return 0;
}