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- n=int(input())
- n*=2
- tl=1
- tr=n>>1
- while(abs(tr-tl)!=1 and abs(tr-tl)!=0):
- tm=(tr+tl)>>1
- if(tm**2<=n):
- tl=tm
- else:
- tr=tm
- print(min(tl,tr))
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