N, X, Y = map(int, input().split())
diff = [0 for i in range(X + Y)]
ans = 0
for i in range(N):
	P, c = input().split()
	P = int(P)
	c = {'A': 1, 'B': -1}[c]
	diff[i % (X + Y)] += P * c
	ans += P * (1 - c) // 2
diff = sorted(diff)[::-1]
for i in range(X):
	ans += diff[i]
print(ans)