#include <string>
#include <iostream>
#include <vector>
using namespace std;
int main() {
long long t, n, k, result;
cin>>t;
while(t--){
cin>>n>>k;
result = (n-k)/6.0;
if((n-k)% 6 != 0)
result++;
}
cout<<result<<endl;
return 0;
}
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