#includeusing namespace std; bool overlap(int a, int b, int c, int d){ if ( d <= a ) return false; if ( b <= c ) return false; return true; } main(){ int a, b, s, f, n; cin >> a >> b >> n; for ( int i = 0; i < n; i++ ){ cin >> s >> f; if ( overlap(a, b, s, f) ){ cout << 1 << endl; return 0; } } cout << 0 << endl; return 0; }