N=input();T=input();A=map(int,raw_input().split());D={A[0]:""}
for i in xrange(1,N):
    E={}
    for k,v in D.items():
        for l,w in[(k+A[i],v+"+"),(k*A[i],v+"*")]:
            if l<=T and(l not in E or E[l]<w):E[l]=w
    D=E
print [-1,D[T]][T in D]