# Mean before 0

Given a sequence of floating-point numbers, your task is to find out the mean of all the numbers that appear before the first 0 in the sequence.

The input of the program contains a sequence of floating-point numbers. Everything after 0 should be ignored. It’s guaranteed that the input contains at least one number before the first 0.

The program should print a single number - the average of the sequence before 0.

Input | Output |

6.4
5.6
10
2
0
5 | 6 |

#### Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB