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