#include <stdio.h>

int main(void)
{
int n;
int a, b, c, l, s, m;
scanf("%d", &n);
switch(n)
{
case 1:
scanf("%d %d", &a, &b);
l = 2 * (a + b);
printf("長方形の辺の長さ：%d", l);
break;

case 2:
scanf("%d %d", &a, &b);
s = a * b;
printf("長方形の面積：%d", s);
break;

case 3:
scanf("%d %d %d", &a, &b, &c);
m = a * b * c;
printf("直方体の面積：%d", m);
break;

default:
printf("不正な入力です");
break;
}
return 0;
}