**Problem :**

Functions are a bunch of statements glued together. A function is provided with zero or more arguments, and it executes the statements on it. Based on the return type, it either returns nothing (void) or something.

A sample syntax for a function is

```
return_type function_name(arg_type_1 arg_1, arg_type_2 arg_2, ...) {
...
...
...
[if return_type is non void]
return something of type `return_type`;
}
```

For example, a function to read four variables and return the sum of them can be written as

```
int sum_of_four(int a, int b, int c, int d) {
int sum = 0;
sum += a;
sum += b;
sum += c;
sum += d;
return sum;
}
```

You have to write a function *int max_of_four(int a, int b, int c, int d)* which reads four arguments and returns the greatest of them.

```
+= : Add and assignment operator. It adds the right operand to the left operand and assigns the result to the left operand.
a += b is equivalent to a = a + b;
```

**Input Format** :

Print the greatest of the four integers.*PS:* I/O will be automatically handled.

**Sample Input** :

```
3
4
6
5
```

**Sample Output** :

`6`

**Solution :**

```
#include <iostream>
#include <cstdio>
using namespace std;
int max_of_four(int a, int b, int c, int d) {
if (a > b)
if (c > d)
if (a > c)
return a;
else
return c;
else if (a > d)
return a;
else
return d;
else if (c > d)
if (b > c)
return b;
else
return c;
else if (b > d)
return b;
else
return d;
}
int main() {
int a, b, c, d;
scanf("%d %d %d %d", &a, &b, &c, &d);
int ans = max_of_four(a, b, c, d);
printf("%d", ans);
return 0;
}
```

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