print ('hello world')

a = 45678+0x12fd2
print (a);

a = 'Learn python'
print (a);

print(100<99)
print(0xff == 255)
print ('400','456')

x1 = 1
d = 3
n = 100
x100 = x1+(n-1)*d
s = (x1+x100)*100/2
print (s)