#include<stdio.h>
void printNumbers(int n,int current){
    if (current>n)
      return;
    
    printf("%d\n",current);
    printNumbers(n,current+1);
    }
    int main(){
        int n;
        scanf("%d",&n);
        if(n<1||n>20){
            printf("Invalid input");
        }
    }
    printNumbers(n,1);
    return 0;
}