x=int(input('nhap so kWh dien dung'))

if x>0 and x<=50:

 print ('so tien can tra la',x*1678)

elif x>=51 and x<=100:

 print('so tien can tra la',x*1734)

else:

 print('so tien phai tra la',x*2014)

x=int(input('nhap so nam'))

if x%400==0:

 print (x,'la nam nhuan')

else:

 print(x,'la ko phai la nam nhuan')

x=int(input('nhap so nam'))

if x%400==0:

 print (x,'la nam nhuan')

else:

 print(x,'la ko phai la nam nhuan')

x=int(input('nhap so nam'))

if x%400==0:

 print (x,'la nam nhuan')

else:

 print(x,'la ko phai la nam nhuan')

x=int(input('so cam mua la'))

if x<5 :

 print ('so tien can tra la',x*20000)

else:

 print('so tien can tra la',x*18000)

x=int(input('so cam mua la'))

if x<5 :

 print ('so tien can tra la',x*20000)

else:

 print('so tien can tra la',x*18000)

x=int(input('so cam mua la'))

if x<5 :

 print ('so tien can tra la',x*20000)

else:

 print('so tien can tra la',x*18000)

x=int(input('so cam mua la'))

if x<5 :

 print ('so tien can tra la',x*20000)

else:

 print('so tien can tra la',x*18000)

x=int(input('so cam mua la'))

if x<5 :

 print ('so tien can tra la',x*20000)

else:

 print('so tien can tra la',x*18000)

r=int(input('nhap ban kinh'))

cv=2*r*3.14

s=3.14*r**2

print('chu vi hinh tron la',cv)

print('dien tich hinh tron la',s)