#include<stio.h>
int main()
{
    int limit;
    scanf("%d", &limit);
    if (limit < 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;
}