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subset.java
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subset.java
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/*
ID: ...
LANG: JAVA
TASK: subset
*/
import java.io.*;
import java.util.*;
public class subset {
static long sols = 0;
static int sum = 0;
static int halfSum = 0;
public static void main(String [] args) throws IOException {
BufferedReader f = new BufferedReader(new FileReader("subset.in"));
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("subset.out")));
int N = Integer.parseInt(f.readLine());
long hhum[] = new long[781];
for (int i =0; i<=780;i++) {
hhum[i] = 0;
}
hhum[0] = 1;
hhum[1] = 1;
for (int i=2;i<=N;i++) {
int endi = i * (i+1)/2;
for (int j = endi;j>=i;j--) {
hhum[j] = hhum[j] + hhum[j-i];
}
}
sum = 0;
for (int i = 1;i<=N;i++) {
sum += i;
}
if (sum % 2 == 0) {
halfSum = sum / 2;
sols = hhum[halfSum] / 2;
}
out.println(sols);
out.close(); // close the output file
System.exit(0); // don't omit this!
}
}