#import functions.mathoperation
#res=functions.mathoperation.add(50,20)
#print(res)
#res=functions.mathoperation.sub(50,20)
#print(res)
#res=functions.mathoperation.mul(50,20)
#print(res)
#res=functions.mathoperation.div(50,20)
#print(res)


#from functions.mathoperation import add,mul,div,sub or
#from functions.mathoperation import *
import functions.mathoperation as fun
res=fun.add(50,20)
print(res)
res=fun.sub(50,20)
print(res)
res=fun.mul(50,20)
print(res)
res=fun.div(50,20)
print(res)