import sys

def main():
    input = sys.stdin.read().split()
    idx = 0
    N = int(input[idx]); idx += 1
    M = int(input[idx]); idx += 1
    P = int(input[idx]); idx += 1
    Q = int(input[idx]); idx += 1

    for _ in range(Q):
        x = int(input[idx]); idx += 1
        f = int(input[idx]); idx += 1
        
        x_mod = x % P
        if x_mod == 0:
            if f % P == 0:
                print(M)
            else:
                print(0)
            continue
        
        f_mod = f % P
        inv_x = pow(x_mod, P-2, P)
        a = (f_mod * inv_x) % P
        
        if a == 0:
            ans = M // P
        else:
            if a > M:
                ans = 0
            else:
                ans = (M - a) // P + 1
        print(ans)

if __name__ == "__main__":
    main()