#include<stdio.h>
#include<string.h>
void reverse(char s[]){
    int i=0,j=strlen(s)-1;
    while (i<j){
        char temp =s[i];
        s[i]=s[j];
        s[j]=temp;
        i++;
        j--;
    }
}
int main(){
    long long N;
    if(scanf("%lld",&N)!=1||N<=0){
        printf("Invalid Input\n");
        return 0;
    }
    char result[1000];
    int i=0;
    long long xN+1;
    while(x>1){
        int bit =x%2;
        x /= 2;
        if(bit==0){
            result[i++]='3';
        }else{
            result[i++]='4';
        }
    }
    result[i]='\0';
    reverse(result);
    printf("&s\n",result);
    return 0;
}