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import math
n,k=map(int, input().split())
boys=[0]*6
girls=[0]*6
for _ in range(n):
s,y=map(int,input().split())
if s==0: girls[y-1]+=1
else:boys[y-1]+=1
cnt=0
for i in range(6):
cnt+=int (math.ceil( boys[i]/k)) +int (math.ceil( girls[i]/k))
print(cnt)
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cs |
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