#1.1
tall = (5*5)-4
tall = tall-1
print(tall)
#1.2
a = 10
b = 1
i = b
while i<a:
    b = b+i
    print(b)
    i=i+2
print(b)
#1.3
serie = "0"
for i in range(5,10):
    serie = serie + str(i)
print("serie=" + serie)