a=int(raw_input('Enter the value of a:'))
b=int(raw_input('Enter the value of b:'))
print ' 1. add 2.sub 3.mul 4. div 5.exp'
n=int(raw_input('Enter the choice:'))
if n==1:
c=a+b
print 'Added value is:',c
elif n==2:
if a>b: #Nested if else
c=a-b
print 'Subtracted value is:',c
else:
c=b-a
print 'Subtracted value is:',c
elif n==3:
c=a*b
print 'Multiplication value is:',c
elif n==4:
if b==0: #Nested if else
print 'Division by zero not defined'
else:
c=float(a)/b
print 'Divison value is:',c
elif n==5:
c=a**b
print 'Exponent value is:',c
else:
print 'Invalid options'
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