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