content: package v123;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.StringTokenizer;
  
  public class WaterGateManagement_UVa12346 {
  
  	static final int INF = (int) 1e9;
  	static final double EPS = 1e-9;
  	static int[] F, C;
  	static int N;
  	
  	static long bt(int idx, double neededFlow)
  	{
  		if(idx == N)
  			return neededFlow < EPS ? 0 : INF;
  		return Math.min(bt(idx + 1, neededFlow), C[idx] + bt(idx + 1, neededFlow - F[idx]));
  	}
  	
  	public static void main(String[] args) throws Exception 
  	{
  		Scanner sc = new Scanner(System.in);
  		PrintWriter out = new PrintWriter(System.out);
  
  		N = sc.nextInt();
  		F = new int[N];
  		C = new int[N];
  		for(int i = 0; i < N; ++i)
  		{
  			F[i] = sc.nextInt();
  			C[i] = sc.nextInt();
  		}
  		
  		int tc = sc.nextInt();
  		for(int t = 1; t <= tc; ++t)
  		{
  			double V = sc.nextInt(), T = sc.nextInt();
  			long ans = bt(0, V / T);
  			if(ans == INF)
  				out.printf("Case %d: IMPOSSIBLE\n", t);
  			else
  				out.printf("Case %d: %d\n", t, ans);
  		}
  		
  		out.flush();
  		out.close();
  	}
  	
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
  
  		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
  
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
  
  		public long nextLong() throws IOException {return Long.parseLong(next());}
  
  		public String nextLine() throws IOException {return br.readLine();}
  
  		public double nextDouble() throws IOException
  		{
  			String x = next();
  			StringBuilder sb = new StringBuilder("0");
  			double res = 0, f = 1;
  			boolean dec = false, neg = false;
  			int start = 0;
  			if(x.charAt(0) == '-')
  			{
  				neg = true;
  				start++;
  			}
  			for(int i = start; i < x.length(); i++)
  				if(x.charAt(i) == '.')
  				{
  					res = Long.parseLong(sb.toString());
  					sb = new StringBuilder("0");
  					dec = true;
  				}
  				else
  				{
  					sb.append(x.charAt(i));
  					if(dec)
  						f *= 10;
  				}
  			res += Long.parseLong(sb.toString()) / f;
  			return res * (neg?-1:1);
  		}
  
  		public boolean ready() throws IOException {return br.ready();}
  	}
  }