#include<iostream>
#include <bits/stdc++.h>

# define ld  long double
#define ll long long
#define IO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;
const int N = 1e6 + 5, mod = 998244353, M = 17;

int a, b;

bool good(ll sum, ll base) {
    // sum / base >= a/b
    return sum * b >= a * base;
}

void getInput() {
    string s;
    cin >> s;
    bool f = false;
    for (auto i: s) {
        if (i == '/')f = true;
        else {
            if (!f) a = a * 10 + i - '0';
            else b = b * 10 + i - '0';
        }
    }
}

void doWork() {
    getInput();
  
    int g = __gcd(a, b);
    a /= g;
    b /= g;
    int lvl = 2000;
    vector<int> cnt(lvl + 1, 1);
    cnt.back() = 3000 / b * b - lvl;
    ll sum = (lvl - 1) * (lvl - 2) / 2 + lvl * cnt.back();
    ll base = 3000 / b * b;
    for (int i = cnt.size() - 1; i >= 2; i--) {
        while (cnt[i] && good(sum - 1, base)) {
            cnt[i]--;
            cnt[i - 1]++;
            sum--;
        }
    }
    if (sum * b != a * base) {
        cout << "impossible";
        return;
    }
    cout << base << " " << base - 1 << "\n";
    int last = 1;
    for (int i = 1; i < cnt.size(); i++) {
        for (int j = 1; j <= cnt[i]; j++) {
            cout << last << " " << last + j << "\n";
        }
        last += cnt[i];
    }
}

int main() {
    IO
    int t = 1;
    //  cin >> t;
    for (int i = 1; i <= t; i++) {
        doWork();
    }
}