#include <cstdio>

int main() {
    int x;
    scanf("%d", &x);
    int nick = 3 * x;
    int shaun = nick - 8;
    double total = x + nick + shaun; // 或者直接计算 total = 7 * x - 8;
    double average = total / 3.0;
    printf("%d\n", nick);
    printf("%d\n", shaun);
    printf("%.1f\n", average);
    return 0;
}
/**************************************************************
	Problem: 1601
	User: huangcanwu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:1144 kb
****************************************************************/