#include<stdio.h>
int main(){
    void printNaturalNumbers(int n, int current){
        if(current > n){
            return;
        }
        printf("%d",&n);
        printNaturalNumbers(n, current + 1);
    }
    int main(){
        int n,
        if(scanf("%d",&n) ! = 1){
            return 0;
        }
        if(n<1){
            printf("Invalid input\n");
        } else {
              printNaturalNumbers(n, 1);
        }
        return 0;
    }
}