Program

#include <stdio.h>
 
int main()
{
 
    int n, p, q, c;
    scanf("%d", &n);
    c = n;
    while (n)
    {
	scanf("%d%d", &p, &q);
	if (q-p==0 || q-p == 1) c--;
	n--;
    }
    printf("%d\n", c);
    return 0;
}

#include <bits/stdc++.h>
 
using namespace std;
 
int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
 
    int n, p, q, c;
    cin >> n;
    c = n;
    while (n)
    {
	cin >> p >> q;
	if (q-p==0 || q-p==1) c--;
	n--;
    }
    cout << c << '\n';
    return 0;
}

n = int(input())
counter = n
for x in range(n):
    arr = list(map(int, input().split(' ')))
    if ((arr[1] - arr[0]) == 0) or ((arr[1] - arr[0]) == 1): counter-=1
print(counter)

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