#include <stdio.h>

int N; long long V,C[101],D[1001];

int main()
{
	scanf ("%d %lld",&N,&V);
	for (int i=1;i<=N;i++) scanf ("%lld",&C[i]), C[i] += C[i-1];

	int x = 1;
	for (int i=2;i<=N;i++) if (C[x] * i > C[i] * x) x = i;
	for (int i=1;i<=1000;i++){
		D[i] = 1e18;
		for (int j=1;j<=N;j++) if (i >= j){
			if (D[i] > D[i-j] + C[j])
				D[i] = D[i-j] + C[j];
		}
	}

	long long ans = 1e18;
	V -= N;
	if (V < 0) ans = C[N];
	for (int i=0;i<=1000;i++) if (i <= V){
		int r = (V - i + x - 1) / x;
		long long w = C[N] + D[i] + C[x] * r;
		if (ans > w)
			ans = w;
	}
	printf ("%lld\n",ans);

	return 0;
}