G = {"r1":0,
    "r2":0,
    "r3":0,}
def mov(A,B):
    if A in G and B in G:
        G[A] = G[B]
def add(A,B):
    if A in G:
        G[A] += B
def p():
    G[f"r{len(G)}"] = 0
def w(A):
    print(G[A])
add("r1",1)
w("r1")