What does this Zig snippet output?

1const std = @import("std");
2fn sumDigits(n: u32) u32 {
3    if (n < 10) return n;
4    return (n % 10) + sumDigits(n / 10);
5}
6pub fn main() void {
7    std.debug.print("{d}\n", .{sumDigits(12345)});
8}