cf 1255A

#include<bits/stdc++.h>

using namespace std;

int main()
{
    int t;
    scanf("%d", &t);

    while(t--)
    {
        long long a, b;
        cin >> a >> b;

        long long cnt = 0, x = abs(a-b);
        while(x >= 5)
        {
            cnt += x / 5;
            x %= 5;
        }
        while(x >= 2)
        {
            cnt += x / 2;
            x %= 2;
        }
        while(x >= 1)
        {
            cnt += x / 1;
            x %= 1;
        }

        cout << cnt << endl;
    }
}