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- nk = input()
- nk_splited = nk.split()
- n = int(nk_splited[0])
- k = int(nk_splited[1])
- def silnia( i ):
- if ( i < 2 ):
- return 1
- return i * silnia( i-1 )
- print( int(silnia(n) / ( silnia(k) * silnia( n-k) )) )
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