Нефть

from collections import Counter
 
n, sum_a, sum_b = map(int, input('n, сумма в долл., сумма в евро->').split())
a_cost_of_ind = Counter()
b_cost_of_ind = Counter()
for i in range(n):
    a_cost_i, b_cost_i = map(int, input('цена в долл., цена в евро->').split())
    a_cost_of_ind[i] = -a_cost_i
    b_cost_of_ind[i] = -b_cost_i
a_best = a_cost_of_ind.most_common(2)
b_best = b_cost_of_ind.most_common(2)
a_cost_i_1, a_cost_i_2 = [x[0] for x in a_best]
b_cost_i_1, b_cost_i_2 = [x[0] for x in b_best]
if a_cost_i_1 != b_cost_i_1:
    print(sum_a/-a_cost_of_ind[a_cost_i_1] + sum_b/-b_cost_of_ind[b_cost_i_1])
else:
    res_1 = sum_a/-a_cost_of_ind[a_cost_i_1] + sum_b/-b_cost_of_ind[b_cost_i_2]
    res_2 = sum_a/-a_cost_of_ind[a_cost_i_2] + sum_b/-b_cost_of_ind[b_cost_i_1]
    print(max(res_1, res_2))

from collections import Counter
 
n, sum_a, sum_b = map(int, input('n, сумма в долл., сумма в евро->').split())
a_cost_of_ind = Counter()
b_cost_of_ind = Counter()
for i in range(n):
    a_cost_i, b_cost_i = map(int, input('цена в долл., цена в евро->').split())
    a_cost_of_ind[i] = -a_cost_i
    b_cost_of_ind[i] = -b_cost_i
 
a_best = a_cost_of_ind.most_common(min(n,2))
b_best = b_cost_of_ind.most_common(min(n,2))
*a_cost_i_arr, = [x[0] for x in a_best]
*b_cost_i_arr, = [x[0] for x in b_best]
 
if a_cost_i_arr[0] != b_cost_i_arr[0]:
    print(sum_a / -a_cost_of_ind[a_cost_i_arr[0]] + sum_b / -b_cost_of_ind[b_cost_i_arr[0]])
else:
    if n == 1:
        res_1 = sum_a / -a_cost_of_ind[0]
        res_2 = sum_b / -b_cost_of_ind[0]
    else:
        res_1 = sum_a / -a_cost_of_ind[a_cost_i_arr[0]] + sum_b / -b_cost_of_ind[b_cost_i_arr[1]]
        res_2 = sum_a / -a_cost_of_ind[a_cost_i_arr[1]] + sum_b / -b_cost_of_ind[b_cost_i_arr[0]]
    print(max(res_1, res_2))