#include <stdio.h>

int f(int x) {
	int p, q = x;
	int r = 0;
	for(p=2;p<x;p++) {
		if(q % p == 0) {
			r += p;
			q /= p;
			p--;
		}
	}
	return r==0?x:f(r);
}


void main() {
	int st;
	printf("Starttal: ");
	scanf("%d", &st);
	printf("Sluttal: %d\n", f(st));
}