L=[9,-1,10,0,-2]
x=19



def positive_sum(L):
    for n in L:
        if n==x:


print



L=[-1,2,14,0,0,1]


print"sum L:", positive_sum(L)


M=[1,1,2,8,1]


print "sum M:", positive_sum(M)

N=[-1,-2,-3]


print"sum N:",positive_sum(N)

