print "Hello, in this programme you can convert kilometers in miles."
km = int(input("Enter the number of kilometers:"))
miles = km*0.62

print (str(km) + "km = " + str(miles) + "miles")

yes = "yes"
no = "no"

while True:
    repeat = input("Do you want to add new value?")

    if repeat == no:
        print "Have a nice day!"
        break

    elif repeat == yes:
        km = int(input("Enter the number of kilometers:"))
        miles = km * 0.6
        print (str(km) + "km = " + str(miles) + "miles")