def a(x,y,z):#@1.5 X=1, Y=2, Z=3 print(x,y,z) return x+y+z print(a(1+1,2+1,3+1)) print(a(4,5,6)) print(a(1,2,3)+a(4,5,6)) def b(x,y,z): return x+y-z print(b(a(1,2,3),a(4,5,6),a(7,8,9))) def c(n): if n > 0: print("I am from function c") c(n-1) c(3)