import numpy as np
N,V=map(int,input().split())
C=np.array([*map(int,input().split())]).cumsum()
X=C[-1];V-=N
if V<0:exit(print(X))
m=N*np.argmin(C/[*range(1,N+1)])+N
X+=V//m*C[m//N-1];V%=m
d=np.array([0]+[1<<60]*V)
for i in range(1,N+1):
 for _ in[0]*V:d[i:]=np.minimum(d[i:],d[:-i]+C[i-1])
print(X+d[V])