Bus Travelling

Time Limit: 1 sec

**The Problem**

**Mr. Khan** was going to Dhaka from Chittagong. Suddenly a thought came to his mind. He was thinking if a bus runs **D** km in **T** hours since **8 in the morning** on the way from Chittagong to Dhaka, and reached Dhaka at **3 in the noon** then what will be the average speed of the bus. He also came in a conclusion that average speed can not mean the bus travels average speed in every hour rather it might travel sometimes faster or sometimes slower than the average speed

**The Input**

The input file contains 7 integer number which denotes the **Distances.**

**The Output**

Output will show the **Average Speed** in a separate line.

**Sample Input**

45 35 20 60 25 55 40

**Sample Output**

40

Problem Setter: Shaquib Mahmud

Special thanks to Samia Safa Ahmed