ZCMU--2195: Cableway(C语言)

Description

A group of university students wants to get to the top of a mountain to have a picnic there. For that they decided to use a cableway.

A cableway is represented by some cablecars, hanged onto some cable stations by a cable. A cable is scrolled cyclically between the first and the last cable stations (the first of them is located at the bottom of the mountain and the last one is located at the top). As the cable moves, the cablecar attached to it move as well.

The number of cablecars is divisible by three and they are painted three colors: red, green and blue, in such manner that after each red cablecar goes a green one, after each green cablecar goes a blue one and after each blue cablecar goes a red one. Each cablecar can transport no more than two people, the cablecars arrive with the periodicity of one minute (i. e. every minute) and it takes exactly 30 minutes for a cablecar to get to the top.

All students are divided into three groups: r of them like to ascend only in the red cablecars, g of them prefer only the green ones and b of them prefer only the blue ones. A student never gets on a cablecar painted a color that he doesn't like,

The first cablecar to arrive (at the moment of time 0) is painted red. Determine the least time it will take all students to ascend to the mountain top.

Input

The first line contains three integers r, g and b (0≤r,g,b≤100). It is guaranteed that r+g+b>0, it means that the group consists of at least one student.

Output

Print a single number − the minimal time the students need for the whole group to ascend to the top of the mountain.

Examples

Input

1 3 2

Output

34

Input

3 2 1

Output

33

题意：给出红绿蓝每组人数，然后缆车从t=0开始按照红绿蓝每一秒来一种，循环颜色，一次最多两个人，缆车到终点需要30s，问全部人上去需要多少时间。

解析：我们可以利用while(1)然后模拟每一次，对应组人数-2，直到三组人都小于0，表示全部人都上车了，最后加上29s即可(因为 t 从0开始)。

#include 
int main()
{
	int r,g,b,t=0;
	scanf("%d%d%d",&r,&g,&b);
	while(1){
		if(r>0||g>0||b>0) r-=2,t++;//红色缆车 
		else break;//如果已经全部上车，立刻退出 
		if(r>0||g>0||b>0) g-=2,t++;//绿色缆车 
		else break;
		if(r>0||g>0||b>0) b-=2,t++;//蓝色缆车 
		else break;
	}
	printf("%d\n",t+29);//上山需要30s，但t从0开始，+29 
	return 0;
}