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#include <cstdio>
#include <climits>
using namespace std;
const long long inf = LONG_LONG_MAX;
const long long maxN = 505;
long long n;
long long mat[maxN][maxN];
long long numere[maxN];
void citire()
{
scanf("%lld", &n);
for(long long i = 0; i <= n; i++)
{
scanf("%lld", &numere[i]);
}
}
void dinamic()
{
for(long long y = 1; y < n; y++)
{
long long i, j;
i = 1;
j = y + 1;
while(j <= n)
{
long long minim = inf;
for(long long k = i; k < j; k++)
{
long long tmp = mat[i][k] + mat[k + 1][j] + numere[i - 1] * numere[k] * numere[j];
if(tmp < minim)
{
minim = tmp;
}
}
mat[i][j] = minim;
i++;
j++;
}
}
}
void afisare()
{
printf("%lld", mat[1][n]);
}
int main()
{
freopen("podm.in", "r", stdin);
freopen("podm.out", "w", stdout);
citire();
dinamic();
afisare();
return 0;
}