Tina’s trainer have given her two positive integers U and V. Now her task is to find the number of pairs if positive intgers(X,Y)

such that 1<=X<=U, 1<=Y<=V and X+Y is even. Tina is finding diffcult to understand the problem.

Can you help her solving the problem?

Input:

The only line of each test case contains two space-separated integers U and V.

Output:

In the Only line of output print a single containing one integer that represents

the number of valid pairs.

```
Input : 17 5
Output: 43
```

#include <stdio.h> int main() { int U,V; int s; //printf("Enter two positive integers : "); scanf("%2d%2d",&U,&V); s=U*V/2+((U%2)*(V%2)); //printf("Valid Pairs : "); printf("%d\n",s); return 0; }

**Input_1:**

Enter two positive integers : 17 5**Output:**

Valid Pairs : 43

**Input_2:**

Enter two positive integers : 56 24**Output:**

Valid Pairs : 672

**ILLUSTRATION**