Problem:
Score : 200 points

Problem Statement

We have a board with H horizontal rows and W vertical columns of squares.
There is a bishop at the top-left square on this board.
How many squares can this bishop reach by zero or more movements?

Here the bishop can only move diagonally.
More formally, the bishop can move from the square at the r_1-th row (from the top) and the c_1-th column (from the left) to the square at the r_2-th row and the c_2-th column if and only if exactly one of the following holds:

r_1 + c_1 = r_2 + c_2

r_1 - c_1 = r_2 - c_2

For example, in the following figure, the bishop can move to any of the red squares in one move:

Constraints

1 \leq H, W \leq 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

H \ W

Output

Print the number of squares the bishop can reach.

Sample Input 1

4 5

Sample Output 1

10

The bishop can reach the cyan squares in the following figure:

Sample Input 2

7 3

Sample Output 2

11

The bishop can reach the cyan squares in the following figure:

Sample Input 3

1000000000 1000000000

Sample Output 3

500000000000000000

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<bits/stdc++.h>
using namespace std;

#define REP(i,a,b) for(int i = (a) ; i < (int)(b) ; ++i )
#define _REP(i,a,b) for(int i = (a) ; i <= (int)(b) ; ++i )
#define UREP(i,u) for(int i = p[(u)] ; i + 1 ; i = edge[i].next)
//iterator: for(int u:x),x is container
#define x(p) (p).first
#define y(p) (p).second
#define mp(x,y) make_pair((x), (y))
#define ll long long
#define inf 0x3f3f3f3f
#define mem(x,v) memset((x), (v), sizeof (x))
#define _ri1(x) scanf("%d", &(x))
#define _ri2(x,y) scanf("%d%d", &(x), &(y))
#define _ri3(x,y,z) scanf("%d%d%d", &(x), &(y), &(z))
#define _ri4(a,b,c,d) scanf("%d%d%d%d", &(a), &(b), &(c), &(d))
#define _pi1(a) printf("%d\n", (a))
#define _pi2(a,b) printf("%d%d\n", (a), (b))

#ifdef kinesis
mt19937 rnd(228);
#else
mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
#endif

int h,w;

int main()
{
    #ifndef ONLINE_JUDGE
    freopen("in.txt","r",stdin);
    #endif // ONLINE_JUDGE
    while(_ri2(h,w)==2){
        int l1 = h / 2 + (h%2>0);
        int l2 = l1 - (h%2>0);
        ll ans = 1LL * l1 * (w / 2 + (w%2>0)) + 1LL * l2 * (w - (w / 2 + (w%2>0)));
        printf("%lld\n",ans);
    }
    return 0;
}