diff --git a/Retos/Reto #4 - PRIMO, FIBONACCI Y PAR [Media]/rust/marcoatrs.rs b/Retos/Reto #4 - PRIMO, FIBONACCI Y PAR [Media]/rust/marcoatrs.rs
new file mode 100644
index 0000000000..10912a9b58
--- /dev/null
+++ b/Retos/Reto #4 - PRIMO, FIBONACCI Y PAR [Media]/rust/marcoatrs.rs	
@@ -0,0 +1,66 @@
+fn is_prime(num: i32) -> bool {
+    if num == 2 {
+        return true;
+    }
+    if num < 2 || is_even(num) {
+        return false;
+    }
+    for n in (3..num).step_by(2) {
+        if num % n == 0 {
+            return false;
+        }
+    }
+    return true;
+}
+
+fn is_fibonacci(number: i32) -> bool {
+    let x = 5 * number.pow(2);
+    let psr = f64::sqrt((x + 4) as f64);
+    let nsr = f64::sqrt((x - 4) as f64);
+    if psr == psr.floor() {
+        return true;
+    } else if nsr == nsr.floor() {
+        return true;
+    }
+    return false;
+}
+
+fn is_even(num: i32) -> bool {
+    let res: bool;
+    if num % 2 == 0 {
+        res = true;
+    } else {
+        res = false;
+    };
+    return res;
+}
+
+fn pfe(num: i32) {
+    let prime: &str;
+    let fibo: &str;
+    let even: &str;
+    if is_prime(num) {
+        prime = "es primo";
+    } else {
+        prime = "no es primo";
+    }
+
+    if is_fibonacci(num) {
+        fibo = "fibonacci";
+    } else {
+        fibo = "no es fibonacci";
+    }
+
+    if is_even(num) {
+        even = "es par";
+    } else {
+        even = "es impar";
+    }
+
+    println!("{} {}, {} y {}", num, prime, fibo, even);
+}
+
+fn main() {
+    pfe(2);
+    pfe(7);
+}