#include <iostream>

using namespace std;

long long n,b;
long long h[1000005],p[1000005];
void read()
{
    cin>>n>>b;
    cout<<n<<endl;
    for(int i = 1; i <= n; i++)
    {
        cout<<1<<" "<<i<<endl;
    }
}





int main()
{
    ios_base::sync_with_stdio(false);
#ifdef ONLINE_JUDGE
    freopen("sticks.in", "r", stdin);
    freopen("sticks.out", "w", stdout);
#endif
    read();


    return 0;
}