// expect: 123/
include rt;
int trace;
int step(int v) { trace = trace * 10 + v; return v; }
int add3(int a, int b, int c) { return a + b + c; }
void pn(int x) { rt.put_n(x); rt.put_c(10); }
fn main() {
	int r = add3(step(1), step(2), step(3));
	pn(trace);
	return 0;
}