complete 17614.rs

storage/zeta/rs/completed/17614.rs

@@ -0,0 +1,23 @@
+use std::io::stdin;
+
+fn get_clap(n: i32) -> i32 {
+    if n <= 2 {
+        return 0;
+    }
+    let str_n = n.to_string();
+    let x = str_n
+        .chars()
+        .filter(|c| *c == '3' || *c == '6' || *c == '9')
+        .count();
+
+    return (x as i32) + get_clap(n - 1);
+}
+
+fn main() {
+    let mut str_n = String::new();
+    stdin().read_line(&mut str_n).expect("err");
+
+    let n: i32 = str_n.trim().parse::<i32>().unwrap();
+
+    println!("{}", get_clap(n));
+}