print (let x = 10 in x) + (let x = 20 in let y = 30 in x+y)
print 100 / 2
print 2 / 100
set x = 10
print x
set y = x * (x+1) / 2
print y
print (let x = 10 in x) + (let x = 20 in let y = 30 in x+y)
set x = 20
print x
set x = x + (let x = 3 in x) + x
print x