diff --git a/FunctionsHR.cpp b/FunctionsHR.cpp
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+/*
+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
+
+Input will contain four integers -  , one in each line.
+
+Output 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 && a>c and a>d)
+        return a;
+    else if(b>c && b>d && b>a)
+        return b;
+    else if(c>a && c>b && c>d)
+        return c;
+    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;
+}