diff --git a/README.md b/README.md
index 63ace0e..4ea1dad 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,58 @@
-Hello word
+# Tourist Social Network - System Design
+## Functional requirements:
+- registration of users
+- publishing posts with images and descriptions
+- viewing publications of other users
+- comments on posts
+- rating posts
+- subscribe to other users and receive updates
+- search for popular travel destinations
+- feeds
+
+## Non-functional requirements:
+- DAU = 10 000 000
+- availability 99,95% (4ч23м)
+- geo CIS countries
+- data is always stored
+- no seasonality
+- no more than 1c creation post
+- no limit subscribe
+- max 5 images one post
+- max size image 500 кб
+- max 3000 desc
+- max 200 title
+- one post - one day
+- 5 post view - one day 
+    
+
+## load:
+RPS(write):<br>
+<code>
+    10 000 000 * 1/86 400 = 116
+</code>
+
+RPS(read)<br>
+<code>
+    max_images_in_post = 5<br/>
+    (10 000 000 * (6 * 5)/86 400 = 3500
+</code>
+
+
+Traffic(write)<br/>
+<code>
+images = 5 * 500кБ = 2500 KБ<br/>
+desc = 3000 * 4Б  = 12 KB<br/>
+title = 200 * 4Б = 0.8 КБ<br/>
+116*(2500+12+0.8) = 290 000 КБ/с    
+</code>
+
+
+Traffic(read)<br/>
+<code>
+3500*(2500+12+0.8) = 8 794 800 КБ/с
+</code>
+
+Connections<br/>
+<code>
+10 000 000 * 0.1 = 1 000 000
+</code>
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