PY
py
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# Created by Konstantin K
# 15
# (5*3) (2+100) (14+1)
# index 0
n = int(input())
vyr = input().split(' ')
k = 1
for i in range(len(vyr)):
if int(eval(vyr[i])) == n:
print ("index" , i)
k = 0
break
if k == 1:
print("none")
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OUTPUT
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