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  1. # your code goes here
  2. N=int(input())
  3. c=0
  4. for i in range(N):
  5. 	p,q=map(int,input().split())
  6. 	if(q-p>=2):
  7. 		c+=1
  8. print(c)
  9.  
Success #stdin #stdout 0.05s 9792KB
comments (?)
stdin 
3
1 2
2 3
3 4
stdout 
0
https://ideone.com/DAi0uj
language:
Python 3 (python  3.9.5)
created:
19 days ago
visibility:
public

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