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