import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        FIntervalRunning solver = new FIntervalRunning();
        solver.solve(1, in, out);
        out.close();
    }

    static class FIntervalRunning {
        public void solve(int testNumber, InputReader in, OutputWriter out) {
            long t1 = in.readLong();
            long t2 = in.readLong();
            long a1 = in.readLong();
            long a2 = in.readLong();
            long b1 = in.readLong();
            long b2 = in.readLong();

            if (t1 * a1 + t2 * a2 == t1 * b1 + t2 * b2) {
                out.printLine("infinity");
                return;
            }

            if (a1 < b1 && a2 < b2 || a1 > b1 && a2 > b2) {
                out.printLine(0);
                return;
            }

            if (a1 > b1) {
                long tmp = a1;
                a1 = b1;
                b1 = tmp;
                tmp = a2;
                a2 = b2;
                b2 = tmp;
            }

            if (t1 * a1 + t2 * a2 < t1 * b1 + t2 * b2) {
                out.printLine(0);
                return;
            }

            long diff1 = t1 * b1 - t1 * a1;
            long diff2 = t1 * a1 + t2 * a2 - (t1 * b1 + t2 * b2);

            long ans = 1 + diff1 / diff2 * 2;
            if (diff1 % diff2 == 0) ans--;
            out.printLine(ans);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

        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 long readLong() {
            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 - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

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

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }

    static class OutputWriter {
        private final PrintWriter writer;

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void print(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                if (i != 0) {
                    writer.print(' ');
                }
                writer.print(objects[i]);
            }
        }

        public void printLine(Object... objects) {
            print(objects);
            writer.println();
        }

        public void close() {
            writer.close();
        }

        public void printLine(long i) {
            writer.println(i);
        }

        public void printLine(int i) {
            writer.println(i);
        }

    }
}



Measured memory_bytes: 23380