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