diff --git a/src/main.rs b/src/main.rs
index 3940e86..39e7166 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,6 @@
 mod utils;
 mod spring_model;
+mod my_model;
 mod graph;
 
 use rand::Rng;
@@ -71,7 +72,8 @@ fn main() -> std::io::Result<()> {
     let nodes = nodes_list(size);
     let nodes_next = nodes_list(size);
 
-    let model = Arc::new(RwLock::new(spring_model::InitialModel::new(edges, size)));
+    // let model = Arc::new(RwLock::new(spring_model::InitialModel::new(edges, size)));
+    let model = Arc::new(RwLock::new(my_model::MyModel::new(edges, size)));
 
     let chunks = utils::gen_chunks(size, THREADS);
     for epoch in 0..ITER {
diff --git a/src/my_model.rs b/src/my_model.rs
new file mode 100644
index 0000000..beb67d4
--- /dev/null
+++ b/src/my_model.rs
@@ -0,0 +1,70 @@
+use crate::graph::{EdgeMatrix, NodeVector, Node};
+
+
+const C_REP: f32 = 0.1;
+const C_SPRING: f32 = 0.1;
+
+pub struct MyModel {
+    edges: EdgeMatrix,
+    size: usize,
+    opt_dist: f32,
+}
+
+impl MyModel {
+
+    pub fn new(edges: EdgeMatrix, size: usize) -> MyModel {
+        let opt_dist = 1.0 / (size as f32).sqrt();
+        MyModel{ edges, size, opt_dist }
+    }
+
+    pub fn prepare(& mut self, nodes: &NodeVector) {
+    }
+
+    pub fn step(&self, nodes: &NodeVector, i_node: usize) -> Node {
+
+        let node = nodes[i_node].read().unwrap();
+        let edges = self.edges.read().unwrap();
+
+        let mut node_x = node.x;
+        let mut node_y = node.y;
+        for o in 0..self.size {
+            if o == i_node {
+                continue;
+            }
+            let o_x: f32;
+            let o_y: f32;
+            {
+                let other = nodes[o].read().unwrap();
+                o_x = other.x;
+                o_y = other.y;
+            }
+
+            let d_x = o_x - node_x;
+            let d_y = o_y - node_y;
+            let dist = (d_x * d_x + d_y * d_y).sqrt();
+            let unit_x = d_x / dist;
+            let unit_y = d_y / dist;
+
+            let edge = edges[i_node][o].weight;
+
+            if edge == 0.0 {
+                let f_rep = (C_REP / (dist).powi(2)).min(C_REP);
+                let f_rep_x = f_rep * unit_x;
+                let f_rep_y = f_rep * unit_y;
+
+                node_x -= f_rep_x;
+                node_y -= f_rep_y;
+            } else {
+                let f_spring = C_SPRING * 0.5 * (dist - self.opt_dist);
+                let f_spring_x = f_spring * unit_x;
+                let f_spring_y = f_spring * unit_y;
+                node_x += f_spring_x;
+                node_y += f_spring_y;
+            }
+        }
+        Node {
+            x: node_x,
+            y: node_y,
+        }        
+    }
+}