#include<bits/stdc++.h> using namespace std; int k,x,y,m,n,s,j; int main(){ cin>>x>>y>>k; if(x==y){ cout<<"0"; return 0; } for(int i=1;i<=k;i++){ cin>>s>>m>>j>>n; if(s==1) x+=m; if(s==-1) x-=m; if(j==1) y+=n; if(j==-1) y-=n; if(x<=0&&y<=0) { x=0; y=0; } if(x==y){ cout<<i; return 0; } } if(x!=y) cout<<"-1"; return 0; }