#include <iostream>
#include<array>
#include <bits/stdc++.h>
#include<string>
using namespace std;
int main ()



{
    int mon, nperiod,m,n=0;
    double down, loan,dp,dps[101],val,lperm;

    while(true){
            n=0;
        cin>>mon>>down>>loan>>nperiod;
        if(mon<0)
            break;
        for (int i=0;i<nperiod;i++){
            cin>>m>>dp;
            for(int j=m;j<101;j++)
                dps[j]=dp;
        }
        lperm=loan/mon;
        val=(loan+down);
        val-=val*dps[0];
        while(val<loan)
        {
            n++;
            loan-=lperm;
            val-=val*dps[n];
        }
        if(n==1)
            cout<<n<<" month"<<endl;
        else cout<<n<<" months"<<endl;
    }
    return 0;
}