-100 0 50 1
0
 -1000 0 10 1
5
 -3 1 100 1
3
 1000000000 100000 1000000000 4
5433 13 6 0
 5 1 5 5
1 2 3 4 0
 2 -1 6 1
2
 3 2 30 3
-691070108 -934106649 -220744807
 0 8 5 1
9
 2 -1 1 1
1
 3 2 115 16
24 48 12 96 3 720031148 -367712651 -838596957 558177735 -963046495 -313322487 -465018432 -618984128 -607173835 144854086 178041956
 0 1 1 1
0
 -1000000000 -1000000000 1 1
232512888
 0 2 2143435 4
54343 -13 6 124
 0 69 12 1
1
 3 1 3 1
5
 0 5 8 1
10
 3 2 30 1
3
 2 -1 10 1
2
 -5 -1 10 1
-5
 -1 -1 2143435 4
-1 -123 -5453 141245
 11 0 228 5
-1 0 1 5 -11245
 123 -1 2143435 5
-123 0 123 -5453 141245
 2 2 4 1
2
 3 0 1 1
3
 0 4 1 1
2
 3 2 3 4
6 14 25 48
 3 2 25 2
379195692 -69874783
 -10 1 5 1
100
 1000000000 999999998 1000000000 1
0
 0 3 3 1
1
 1 0 2 1
1
 0 -3 2143435 5
-1 0 1 5 -11245
 11 0 1111 1
11
 2 0 3 1
2
 100 10 2 1
100
 0 5 10 1
2
 123 -1 10000 1
123
 1 5 10000 1
125
 123 0 2143435 4
5433 0 -123 -645
 11 0 228 5
-1 -17 1 5 -11245
 0 23 3 1
3
 3 0 3 1
4
 5 -1 3 1
0
 123 0 2143435 4
5433 0 123 -645
 2 -1 3 1
2
 2 -2 10 1
1
 -3 0 92055 36
-92974174 -486557474 -663622151 695596393 177960746 -563227474 -364263320 -676254242 -614140218 71456762 -764104225 705056581 -106398436 332755134 -199942822 -732751692 658942664 677739866 886535704 183687802 -784248291 -22550621 -938674499 637055091 -704750213 780395802 778342470 -999059668 -794361783 796469192 215667969 354336794 -60195289 -885080928 -290279020 201221317
 -1000 0 100 1
2
 123 -1 2143435 5
-123 0 12 5 -11245
 1 1 1000000000 1
100
 3 0 3 1
0
 1 0 2143435 4
1 -123 -5453 141245
 -3 0 1 1
-3
 2 0 2 1
-1
 123 -1 2143435 4
54343 -13 6 123
 -100 -1 1 1
1
 2 -1 100 1
2
 10 -1 2 1
1
 -1000 0 100 1
-1000
 0 3 100 1
5
 5 2 100 1
5
 -4 1 1 1
0
 -20 0 10 1
0
 -5 0 1 1
1
 10 -1 3 2
10 8
 0 35 2 1
3
 0 5 100 2
34 56
 11 0 2 5
-1 0 1 5 -11245
 0 2 100 1
5
 123 0 125 1
123
 100 0 100000 1
100
 1 -1 1 1
1
 1 -1 2143435 4
1 -123 -5453 141245
 2 2 4 1
3
 15 -1 15 4
15 -15 1 2
 3 2 24 4
6 14 25 48
 1 -1 2 1
1
 123 0 21 4
543453 -123 6 1424
 0 2 30 4
6 14 25 48
 10 10 10 1
123
 2 0 2 1
2
 0 4 1000 3
5 6 7
 -2 0 1 1
1
 0 10 10 1
2
 5 1 2 1
2
 3 3 104 17
9 -73896485 -290898562 5254410 409659728 -916522518 -435516126 94354167 262981034 -375897180 -80186684 -173062070 -288705544 -699097793 -11447747 320434295 503414250
 -10 0 5 1
0
 -3 1 100 1
-3
 0 8 10 1
5
 5 0 20 1
5
 0 0 2143435 5
-1 -153 1 5 -11245
 4 0 4 1
0
 2 0 1 1
2
 5 -1 100 1
5
 1 -2 1000000000 1
0
 0 2 5 1
1
 1 -1 10 1
1

0
 0
 inf
 1
 inf
 inf
 4
 inf
 0
 1
 0
 0
 inf
 inf
 inf
 inf
 3
 inf
 inf
 inf
 1
 0
 1
 0
 inf
 1
 4
 0
 1
 inf
 inf
 0
 inf
 inf
 0
 inf
 inf
 5
 1
 inf
 inf
 inf
 0
 0
 inf
 3
 inf
 0
 inf
 inf
 1
 inf
 0
 inf
 inf
 0
 inf
 0
 0
 inf
 4
 0
 0
 0
 0
 inf
 inf
 0
 inf
 inf
 inf
 inf
 inf
 2
 0
 3
 inf
 0
 inf
 1
 inf
 inf
 0
 inf
 0
 3
 0
 0
 inf
 inf
 inf
 1
 0
 inf
 30
 inf
 inf


import java.util.*;
import java.lang.*;
import java.io.*;

public class Temp {
	static int imax = Integer.MAX_VALUE, imin = Integer.MIN_VALUE;
	static long lmax = Long.MAX_VALUE, lmin = Long.MIN_VALUE;
	static long mod = (long) 1e9 + 7;

	public static void main(String[] args) throws java.lang.Exception {
		InputReader in = new InputReader(System.in);
		PrintWriter out = new PrintWriter(System.out);
		// int test=in.ni();
		int test = 1;
		while (test-- > 0) {
			long b = in.ni();
			long q = in.ni();
			long l = in.ni();
			long m = in.ni();
			HashSet<Long> set = new HashSet<>();
			for (int i = 0; i < m; i++) {
				set.add((long) in.ni());
			}
			if (b > 1 && q > 1) {
				int cnt = 0;
				long tmp = b;
				while (tmp <= l) {
					if (!set.contains(tmp)) {
						cnt++;
					}
					tmp = tmp * q;
				}
				System.out.println(cnt);
			} else {

				ArrayList<Long> set1 = new ArrayList<>();
				long tmp = b;
				for (int i = 0; i < 1000; i++) {
					if (!set.contains(tmp) && tmp <= l)
						set1.add(tmp);
					tmp = tmp * q;
				}
				if (set1.size() <= 2) {
					System.out.println(set1.size());
				} else {
					System.out.println("inf");
				}
			}
		}
		out.close();
	}

	static class Pair {
		int x, y;

		Pair(int x, int y) {
			this.x = x;
			this.y = y;
		}

		public String toString() {
			return x + " " + y;
		}

	}

	static void print(int arr[], int len) {
		for (int i = 0; i < len; i++)
			System.out.print(arr[i] + " ");
		System.out.println();
	}

	static class InputReader {

		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar;
		private int numChars;

		public InputReader(InputStream stream) {
			this.stream = stream;
		}

		public int read() {
			if (numChars == -1)
				throw new InputMismatchException();
			if (curChar >= numChars) {
				curChar = 0;
				try {
					numChars = stream.read(buf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (numChars <= 0)
					return -1;
			}
			return buf[curChar++];
		}

		public int ni() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c & 15;
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public long nl() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			long res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c & 15;
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public String ns() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		public char[] ncs() {
			return ns().toCharArray();
		}

		public String nLine() {
			int c = read();
			// while (c != '\n' && c != '\r' && c != '\t' && c != -1)
			// c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (c != '\n' && c != '\r' && c != '\t' && c != -1);
			return res.toString();
		}

		public static boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

	}

}
