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