Codeforces Round #241 (Div. 2) A Guess a number!

// Codeforces Round #241 (Div. 2) A Guess a number!
// Problems: http://codeforces.com/contest/416/problem/A

import java.io.*;
import java.math.*;
import java.util.*;

//Codeforces
public class MainCodeforces1 {
private static MyScanner in;
private static PrintStream out;
private static boolean LOCAL_TEST = false;

private static void solve() throws IOException
{
int ymin = Integer.MIN_VALUE;
int ymax = Integer.MAX_VALUE;
int n = in.nextInt();
for (int i = 0; i < n; i++) {
String eq = in.nextString();
int x = in.nextInt();
String yn = in.nextString();
if (yn.equals("Y")) {
if (eq.equals(">=")) {
if (x > ymin)
ymin = x;
}
else if (eq.equals("<")) {
if (x - 1 < ymax)
ymax = x - 1;
}
else if (eq.equals(">")) {
if (x + 1 > ymin)
ymin = x + 1;
}
else if (eq.equals("<=")) {
if (x < ymax)
ymax = x;
}
}
else {
if (eq.equals("<")) {
if (x > ymin)
ymin = x;
}
else if (eq.equals(">=")) {
if (x - 1 < ymax)
ymax = x - 1;
}
else if (eq.equals("<=")) {
if (x + 1 > ymin)
ymin = x + 1;
}
else if (eq.equals(">")) {
if (x < ymax)
ymax = x;
}
}
}
if (ymin <= ymax) {
ymin = Math.max(ymin, -2000000000);
ymin = Math.min(ymin, 2000000000);
out.println(ymin);
}
else
out.println("Impossible");

}

public static void main(String[] args) throws IOException {
// helpers for input/output
out = System.out;
try {
String cname = System.getenv("COMPUTERNAME");
if (!cname.equals(""))
LOCAL_TEST = true;
} catch (Exception e) {
}
if (LOCAL_TEST) {
in = new MyScanner("E:\\zin.txt");
}
else {
boolean usingFileForIO = false;
if (usingFileForIO) {
// using input.txt and output.txt as I/O
in = new MyScanner("input.txt");
out = new PrintStream("output.txt");
}
else {
in = new MyScanner();
out = System.out;
}
}

solve();
}

// =====================================
static class MyScanner {
BufferedReader bufReader;
StringTokenizer strTok;

public MyScanner() throws IOException
{
bufReader = new BufferedReader(new InputStreamReader(System.in));
strTok = new StringTokenizer("");
}

public MyScanner(String inputFile) throws IOException {
bufReader = new BufferedReader(new InputStreamReader(
new FileInputStream(
inputFile)));
strTok = new StringTokenizer("");
}

String GetNextToken() throws IOException {
if (!strTok.hasMoreTokens())
strTok = new StringTokenizer(bufReader.readLine());
return strTok.nextToken();
}

public int nextInt() throws IOException {
return Integer.valueOf(GetNextToken());
}

public long nextLong() throws IOException {
return Long.valueOf(GetNextToken());
}

public double nextDouble() throws IOException {
return Double.valueOf(GetNextToken());
}

public String nextString() throws IOException {
return GetNextToken();
}

public String nextLine() throws IOException {
return bufReader.readLine();
}

public int countTokens() {
return strTok.countTokens();
}

public boolean hasMoreTokens() {
return strTok.hasMoreTokens();
}
}

}