x,y,z=map(int,input().split())
if x%z==0:a=x//z
elif x%z!=0:a=(x//z)+1
if y%z==0:b=y//z
elif y%z!=0:b=(y//z)+1
print(a*b)
1547C - Pair Programming | 550A - Two Substrings |
797B - Odd sum | 1093A - Dice Rolling |
1360B - Honest Coach | 1399C - Boats Competition |
1609C - Complex Market Analysis | 1657E - Star MST |
1143B - Nirvana | 1285A - Mezo Playing Zoma |
919B - Perfect Number | 894A - QAQ |
1551A - Polycarp and Coins | 313A - Ilya and Bank Account |
1469A - Regular Bracket Sequence | 919C - Seat Arrangements |
1634A - Reverse and Concatenate | 1619C - Wrong Addition |
1437A - Marketing Scheme | 1473B - String LCM |
1374A - Required Remainder | 1265E - Beautiful Mirrors |
1296A - Array with Odd Sum | 1385A - Three Pairwise Maximums |
911A - Nearest Minimums | 102B - Sum of Digits |
707A - Brain's Photos | 1331B - Limericks |
305B - Continued Fractions | 1165B - Polycarp Training |