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i=0
while i==0:
a = raw_input('>>>')
try:
if a[1] == '+':
print float(a[0])+float(a[2])
elif a[1] == '-':
print float(a[0])-float(a[2])
elif a[2] == '*':
print float(a[0])**float(a[3])
elif a[1] == '/':
print float(a[0])/float(a[2])
elif a[1] =='*':
print float(a[0])*float(a[2])
elif a[1] == '%':
print float(a[0])%float(a[2])
else:
print "Sorry: I don't know!"
except:
print "Please input a correct formula!"