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3986.java
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3986.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Stack;
public class Main {
public static void main(String[] args) throws IOException {
ST st = new ST();
String s = Buff.br.readLine();
int n = Integer.parseInt(s);
int count = 0;
for (int i = 0; i < n; i++) {
st.vs();
if (st.vsb()) {
count++;
}
}
System.out.println(count);
}
static class Buff {
static BufferedReader br;
Buff() {
br = new BufferedReader(new InputStreamReader(System.in));
}
}
}
class ST {
Stack<Character> stack;
Main.Buff ma;
public ST() {
stack = new Stack<Character>();
ma = new Main.Buff();
}
public void vs() throws IOException {
stack = new Stack<Character>();
String ss = ma.br.readLine();
for (int i = 0; i < ss.length(); i++) {
if (stack.isEmpty()) {
stack.add(ss.charAt(i));
} else {
if (stack.peek().equals(ss.charAt(i))) {
stack.pop();
} else {
stack.add(ss.charAt(i));
}
}
}
}
public boolean vsb() {
if (stack.isEmpty()) {
return true;
} else {
return false;
}
}
}