#include <iostream>
#include <math.h>
using namespace std;
int main(void){
    
    unsigned long long p;
    cin >> p;
    unsigned long long result1 = 0;
    unsigned long long result2 = 0;
    unsigned long long result3 = 0;
    
    // 3の倍数
    result1 = (unsigned long long)(powl(10, p) / 3);
    
    // 3の付く数
    unsigned long long init = 1;
    for (int i = 1; i <= p; i++) {
        
        if (i == 1) {
            result2 = init;
        } else {
            result2 = init * 9 + powl(10, i - 1);
            init    = result2;
        }
    }
    
    // 3の倍数かつ3の付く数
    init = 1;
    for (int i = 1; i <= p; i++) {
        
        if (i == 1) {
            result3 = init;
        } else {
            result3  = init * 3 + (init - 1) * 6 + (unsigned long long)(powl(10, i - 1) / 3) + 1;
            init     = result3;
        }
    }
    
    // 出力
    unsigned long long result = result1 + result2 - result3;
    printf("%llu\n", result);
    
    return 0;
}