k, m, n = input().split()
k = int(k)
m = int(m)
n = int(n)
number = []
count = 0
for i in range(0,m):
    a, b = input().split()
    a = int(a)
    b = int(b)
    if b * ( k // a ) >= n:
        count = count + 1
        number.append(i+1)
if count <1:
    print(-1)
elif count == 1:
    print(1, end = " ")
else:
    print(count)
    for i in number:
        print(i, end = " ")