#include<bits/stdc++.h>
using namespace std;
int main()
{
int t;
while(cin>>t)
{
int c=0;
if(!t) break;
while(t--)
{
int a,b;
cin>>a>>b;
if(a<=b) c++;
}
cout<<c<<endl;
}
return 0;
}
using namespace std;
int main()
{
int t;
while(cin>>t)
{
int c=0;
if(!t) break;
while(t--)
{
int a,b;
cin>>a>>b;
if(a<=b) c++;
}
cout<<c<<endl;
}
return 0;
}
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