Buggy python submission (verdict: Runtime Error):
N = int(input())
A = []
for i in range(N):
    a = input()
    b = a.split(".")
    if len(b)==1:
        A.append(int(a)*(10**9))
    else:
        A.append(int(b[0] + b[1] + (9-len(b[1]))*"0"))

B = [[0]*30 for i in range(30)]
ans1 = 0
for i in range(N):
    a = A[i]
    count1 = 0
    while a%2==0:
        a//=2
        count1+=1
    count2 = 0
    while a%5==0:
        a//=5
        count2+=1
    #print(count1,count2,A[i])
    B[count1][count2] += 1
    if count1>=9 and count2>=9:
        ans1+=1

C = [[0]*31 for i in range(31)]

for i in range(30):
    for j in range(30):
        C[i+1][j+1] = B[i][j] + C[i+1][j] + C[i][j+1] - C[i][j]

#print(*C,sep="\n")
ans = 0
for i in range(30):
    for j in range(30):
        k,l = min(18,i),min(18,j)
        #if B[i][j]>0:
        #    print(B[i][j],C[21][21] + C[18-k][18-l] - C[21][18-l] - C[18-k][21],i,j)
        ans += B[i][j] * (C[21][21] + C[18-k][18-l] - C[21][18-l] - C[18-k][21])

print((ans-ans1)//2)


Fixed submission:
N = int(input())
A = []
for i in range(N):
    a = input()
    b = a.split(".")
    if len(b)==1:
        A.append(int(a)*(10**9))
    else:
        A.append(int(b[0] + b[1] + (9-len(b[1]))*"0"))

B = [[0]*50 for i in range(50)]
ans1 = 0
for i in range(N):
    a = A[i]
    count1 = 0
    while a%2==0:
        a//=2
        count1+=1
    count2 = 0
    while a%5==0:
        a//=5
        count2+=1
    #print(count1,count2,A[i])
    B[count1][count2] += 1
    if count1>=9 and count2>=9:
        ans1+=1

C = [[0]*51 for i in range(51)]

for i in range(50):
    for j in range(50):
        C[i+1][j+1] = B[i][j] + C[i+1][j] + C[i][j+1] - C[i][j]

#print(*C,sep="\n")
ans = 0
for i in range(50):
    for j in range(50):
        k,l = min(18,i),min(18,j)
        #if B[i][j]>0:
        #    print(B[i][j],C[21][21] + C[18-k][18-l] - C[21][18-l] - C[18-k][21],i,j)
        ans += B[i][j] * (C[50][50] + C[18-k][18-l] - C[50][18-l] - C[18-k][50])

print((ans-ans1)//2)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = []
for i in range(N):
    a = input()
    b = a.split(".")
    if len(b)==1:
        A.append(int(a)*(10**9))
    else:
        A.append(int(b[0] + b[1] + (9-len(b[1]))*"0"))

B = [[0]*21 for i in range(21)]
ans1 = 0
for i in range(N):
    a = A[i]
    count1 = 0
    while a%2==0:
        a//=2
        count1+=1
    count2 = 0
    while a%5==0:
        a//=5
        count2+=1
    #print(count1,count2,A[i])
    B[count1][count2] += 1
    if count1>=9 and count2>=9:
        ans1+=1

C = [[0]*22 for i in range(22)]

for i in range(21):
    for j in range(21):
        C[i+1][j+1] = B[i][j] + C[i+1][j] + C[i][j+1] - C[i][j]

#print(*C,sep="\n")
ans = 0
for i in range(21):
    for j in range(21):
        k,l = min(18,i),min(18,j)
        #if B[i][j]>0:
        #    print(B[i][j],C[21][21] + C[18-k][18-l] - C[21][18-l] - C[18-k][21],i,j)
        ans += B[i][j] * (C[21][21] + C[18-k][18-l] - C[21][18-l] - C[18-k][21])

print((ans-ans1)//2)


Fixed submission:
N = int(input())
A = []
for i in range(N):
    a = input()
    b = a.split(".")
    if len(b)==1:
        A.append(int(a)*(10**9))
    else:
        A.append(int(b[0] + b[1] + (9-len(b[1]))*"0"))

B = [[0]*50 for i in range(50)]
ans1 = 0
for i in range(N):
    a = A[i]
    count1 = 0
    while a%2==0:
        a//=2
        count1+=1
    count2 = 0
    while a%5==0:
        a//=5
        count2+=1
    #print(count1,count2,A[i])
    B[count1][count2] += 1
    if count1>=9 and count2>=9:
        ans1+=1

C = [[0]*51 for i in range(51)]

for i in range(50):
    for j in range(50):
        C[i+1][j+1] = B[i][j] + C[i+1][j] + C[i][j+1] - C[i][j]

#print(*C,sep="\n")
ans = 0
for i in range(50):
    for j in range(50):
        k,l = min(18,i),min(18,j)
        #if B[i][j]>0:
        #    print(B[i][j],C[21][21] + C[18-k][18-l] - C[21][18-l] - C[18-k][21],i,j)
        ans += B[i][j] * (C[50][50] + C[18-k][18-l] - C[50][18-l] - C[18-k][50])

print((ans-ans1)//2)