public class p4_16
{
    static int fac(int n)
    {
        int fa;
        if(n==1)
            fa=1;
        else
            fa=n+fac(n-1);
        return fa;
    }
    public static void main(String []args)
    {
        int n=50;
        int f1=fac(n);
        System.out.println("50+49+48+...+1="+f1);
    }
}