# BOJ: 8370 Plane

# 문제

Byteland Airlines recently extended their aircraft fleet with a new model of a plane. The new acquistion has \(n_{1}\) rowos of seats in the business class and \(n_{2}\) rows in the economic class. In the business class each row contains \(k_{1}\) seats, while each row in the economic class has \(k_{2}\) seats.

Write a program which:

- reads information about available seats in the plane,
- calculates the sum of all seats available in that plane,
- writes the result.

## 입력

In the first and only line of the standard input there are four integers \(n_{1}, k_{1}, n_{2}\) and \(k_{2} (1 \leq n_{1}, k_{1}, n_{2}, k_{2} \leq 1000)\), separated by single spaces.

## 출력

The first and only line of the standard output should contain one integer - the total number of seats available in the plane.

### 예제 입력 1

```
2 5 3 20
```

### 예제 출력 1

```
70
```

# 코드

```
#include <bits/stdc++.h>
using namespace std;
int main(void) {
int n1, k1, n2, k2;
cin>>n1>>k1>>n2>>k2;
cout<<(n1*k1)+(n2*k2);
return 0;
}
```

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