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