import java.io.IOException;
public class Triangle {
public static void main(String[] args) throws IOException {
int theNumber = 100;
int theAnswer = triangle(theNumber);
System.out.println("Triangle=" + theAnswer);
}
public static int triangle(int n) {
if (n == 1)
return 1;
else
return (n + triangle(n - 1));
}
}