T710749 D. 小灯求石 [Hello World 2026 蓝桥杯选拔赛]

#include <stdio.h>

int n, ans;

int main() {
    scanf("%d", &n);
    while (n != 1) {
        ++ans;
        n = (n + 2) / 3;
    }
    printf("%d\n", ans);

    return 0;
}