Problem:
Score : 100 points

Problem Statement

You are given two positive integers a and b.
Let x be the average of a and b.
Print x rounded up to the nearest integer.

Constraints

a and b are integers.

1 \leq a, b \leq 100

Input

Input is given from Standard Input in the following format:

a b

Output

Print x rounded up to the nearest integer.

Sample Input 1

1 3

Sample Output 1

2

The average of 1 and 3 is 2.0, and it will be rounded up to the nearest integer, 2.

Sample Input 2

7 4

Sample Output 2

6

The average of 7 and 4 is 5.5, and it will be rounded up to the nearest integer, 6.

Sample Input 3

5 5

Sample Output 3

5

Solution in C++ (GCC 9.2.1) (judge verdict: Accepted)

#include <bits/stdc++.h>

#include <algorithm>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
#define REP(i, n) for (long long i = 0; i < (n); i++)
const ll INF = 1LL << 60;
struct Fast {
    Fast() {
        cin.tie(0);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(20);
    }
};
signed main() {
    int a, b;
    cin >> a >> b;
    if ((a + b) % 2 == 0) {
        cout << (a + b) / 2 << endl;
        return 0;
    }
    cout << (a + b) / 2 + 1 << endl;
}