#include<stdio.h>
int main()
{
    int limit,a=0,b=1,n;
    scanf("%d",&limit);
    if(limit<0)
    {
        printf("Invalid input");
    }
    else
    {
        for(a=0;b=1;a<=limit)
        {
            printf("%d",a);
            n=a+b;
            a=b;
            b=n;
        }
    }
    return 0;
}