print("hello everyone")
print("waelcome to python")
print("sum=",55+77)
print("dif=",66-33)
print("mul=",10*5)
num1=50
num2=30
print("before swapping",num1,num2)
#temp=num2
#num2-num1
#num1=temp
'''num1=num1+num2
num2=num1-num2
num1=num1-num2'''
num1,num2=num2,num1
print("after swapping",num1,num2)
