
a = 10
b = 3


#Arithmetic operator + - / *
minus = a - b
print("sum %d"%(a + b))
print(minus)

years = [ 2017, 2018, 2016, 111, 1121 ]
print(len(years))
sum = 0

for year in years:
    sum= sum+year
    a = 1
    b =2

print(sum)


if 1 == 2 :
    print("hello")
else :
    print("not true")