diff --git a/pyramid.sol b/pyramid.sol
new file mode 100644
index 0000000..f024d3c
--- /dev/null
+++ b/pyramid.sol
@@ -0,0 +1,61 @@
+pragma solidity ^0.4.24;
+contract Pyramid {
+
+    ///Constants
+    uint constant public ticketPriceInWei = 10 ** 18;
+    uint constant public ticketSaleFeePercentage = 1;
+    uint constant public ticketRedemptionFeePercentage = 10;
+    address public owner;
+    
+    ///bookkeeping
+    address[] public listOfTicketOwners;
+    mapping (address => uint) public ticketsOwnedBy;
+    mapping (address => uint) public balanceOf;
+    uint public totalTickets = 0;
+    
+    //Create a new contract
+    constructor() public {
+        owner = msg.sender;
+    }
+
+    //Increase ticket ownership count, return remainder to sender
+    //Payout owner their fee
+    //Update balance of every token owner
+    function buyTicket() public payable {
+        uint numTicketsBought = msg.value/ticketPriceInWei;
+        totalTickets +=numTicketsBought;
+        ticketsOwnedBy[msg.sender] += numTicketsBought;
+        //Send back remainder
+        msg.sender.transfer(msg.value%ticketPriceInWei);
+        //Add message sender to list of token owners
+        bool isContainedInArray = false;
+        uint arrayLength = listOfTicketOwners.length;
+        for(uint i = 0; i < arrayLength; i++) {
+            if (listOfTicketOwners[i] == msg.sender) {
+                isContainedInArray = true;
+            }
+        }
+        if (!isContainedInArray) {
+            listOfTicketOwners.push(msg.sender);
+        }
+        //Pay owner's fee
+        owner.transfer(ticketSaleFeePercentage*ticketPriceInWei*numTicketsBought/100);
+        
+        //Increase balance of every token owner
+        arrayLength = listOfTicketOwners.length;
+        for(uint j = 0; j < arrayLength; j++) {
+            address ownerAddress  = listOfTicketOwners[j];
+            balanceOf[ownerAddress] += ticketsOwnedBy[ownerAddress]*(100 - ticketSaleFeePercentage)*ticketPriceInWei*numTicketsBought/100/totalTickets;
+        }
+    }
+    
+    //Pay owner the fee
+    //Pay sender their balance minus fee
+    //+Bookkeeping
+    function redeemAllTickets() public {
+        owner.transfer(ticketRedemptionFeePercentage*balanceOf[msg.sender]/100);
+        msg.sender.transfer((100 - ticketRedemptionFeePercentage)*balanceOf[msg.sender]/100);
+        balanceOf[msg.sender] = 0;
+        ticketsOwnedBy[msg.sender] = 0;
+    }
+}
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