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