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#include <iostream>
#include <fstream>
#include <climits>
using namespace std;
ifstream in("podm.in");
ofstream out("podm.out");
const int NMAX=INT_MAX;
int d[505];
unsigned int dp[505][505]; //dp[i][j] nr minim de operatii scalare pt matriciile din intervalul i si j
int main()
{
int n;
unsigned int sol_crt;
in>>n;
for(int i=0; i<=n; i++)
in>>d[i];
for(int i=1; i<=n; i++)
for(int j=1; j<=n; j++)
dp[i][j]=NMAX;
for(int i=1; i<=n; i++)
dp[i][i]=0;
for(int l=2; l<=n; l++)
{
for(int i=1; i<=n-l+1; i++)
{
int j=i+l-1;
for(int k=i; k<j; k++)
{
sol_crt=dp[i][k]+dp[k+1][j]+ d[i-1]*d[k]*d[j];
dp[i][j]=min(dp[i][j],sol_crt);
}
}
}
out<<dp[1][n];
return 0;
}