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