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