import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.NoSuchElementException;
import java.util.PriorityQueue;

class Edge {
	int src,dst,cst;
	public Edge(int src_,int dst_,int cst_) {
		src=src_;
		dst=dst_;
		cst=cst_;
	}
}

public class Main {

	public static void main(String[] args) {
		new Main().run();
	}
	
	int dist(int id, int fst, int snd) {
		if (Integer.compare(fst, snd)==Integer.compare(fst, id)) {
			return 2*Math.abs(fst-id)-1;
		} else {
			return 2*Math.abs(fst-id);
		}
	}
	
	int id(int dist, int fst, int snd) {
		int sign=Integer.compare(fst, snd)*(1-dist%2*2);
		return fst+(dist+1)/2*sign;
	}
	
	boolean disjoint(int id, boolean[] on) {
		boolean ret=true;
		for(int i=Math.max(0, id-1);i<=Math.min(on.length-1, id+1);++i) {
			ret&=!on[i];
		}
		return ret;
	}
	
	void run() {
		FastScanner sc=new FastScanner();
		int N=sc.nextInt();
		int fst=sc.nextInt()-1;
		int snd=sc.nextInt()-1;
		int Q=sc.nextInt();
		int[] ans=new int[Q];
		Arrays.fill(ans, -1);
		PriorityQueue<Integer> disjoint=new PriorityQueue<>();
		PriorityQueue<Integer> adjacent=new PriorityQueue<>();

		for(int i=0;i<N;++i) {
			disjoint.add(i);
		}
		int[][] in=new int[Q+1][2];
		int[][] out=new int[Q+1][2];
		for(int i=0;i<Q;++i) {
			in[i][0]=sc.nextInt();
			out[i][0]=in[i][0]+sc.nextInt();
			in[i][1]=i;
			out[i][1]=i;
		}
		int INF=Integer.MAX_VALUE/3;
		in[Q][0]=out[Q][0]=INF;
		in[Q][1]=out[Q][1]=-1;
		Arrays.sort(in, Comparator.comparing(v->v[0]));
		Arrays.sort(out, Comparator.comparing(v->v[0]));
		boolean[] on=new boolean[N];
		int u=0,v=0;
		while(u!=Q || v!=Q) {
			if(out[u][0]<=in[v][0]) { // out[u]を実行
				int id=ans[out[u][1]];
				on[id]=false;
				if(disjoint(id, on)) disjoint.add(dist(id,fst,snd));
				else adjacent.add(dist(id,fst,snd));
				++u;
			}else{ // in[v]を実行
				while(!disjoint.isEmpty() && (!disjoint(id(disjoint.peek(),fst,snd), on) || on[id(disjoint.peek(),fst,snd)])) {
					disjoint.poll();
				}
				if(disjoint.isEmpty()&&adjacent.isEmpty()) {
					in[v][0]=out[u][0];
					continue;
				}
				int dist=!disjoint.isEmpty()?disjoint.poll():adjacent.poll();
				int id=id(dist,fst,snd);
				if(on[id]) continue;
				ans[in[v][1]]=id;
				on[id]=true;
				for(int i=Math.max(0, id-1);i<=Math.min(N-1, id+1);++i) {
					if(!on[i] && !disjoint(i, on)) adjacent.add(dist(i, fst, snd));
				}
				++v;
			}
		}
		PrintWriter pw=new PrintWriter(System.out);
		for(int i=0;i<Q;++i) {
			pw.println(ans[i]+1);
		}
		pw.close();
	}
	
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    
    public double nextDouble() { return Double.parseDouble(next());}
}