l=[50,50,50,20,20,20,20,20,20,10,10,10,10,10,5,5,5]
from itertools import combinations
c= list(combinations(l,4))
#print (c)
for n in range(0,len(c)):
    d= (c[n][0]+c[n][1]+c[n][2]+c[n][3])
    if d==80:
        l=[]
        l.append(d)
        print (l)