#include<cstdio>
#include<vector>


using namespace std;
using ll=long long;


int main(void)
{
	int n, v, i, j, m;
	vector<int> c;
	ll s, s_add, s_min;

	while(scanf("%d%d", &n, &v)==2)
	{
		c.clear();
		c.resize(n, 0);
		s=0;
		for(i=0;i<n;i++)
		{
			scanf("%d", &c[i]);
			s+=c[i];
		}

		if(v<=n)
		{
			printf("%lld\n", s);
			continue;
		}

		v-=n;
		s_min=s+(ll)c[0]*v;
		for(i=1;i<=n;i++)
		{
			m=v-v/i*i;
			s_add=0;
			for(j=0;j<i;j++)
			{
				s_add+=(ll)c[j]*(v/i+(j<m));
			}
			if(s_min>s+s_add)
			{
				s_min=s+s_add;
			}
		}
		printf("%lld\n", s_min);
	}

	return 0;
}