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