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