import time
import math
import sys
t1=time.clock()
Compare=0
fileopen=open("in16_9.txt")
fileout=open("out_16_9.txt","w")
j=fileopen.readline().split(",")
N=int(j[2])
K=int(j[0])
X=int(j[1])
Count=0
optimal=math.sqrt(N)
S=int(optimal)
for i in range(S,N,S):
    Count+=1
    if(i>X):
        m=i-X+1
        Count+=m
        break
Compare=Count
mem=sys.getsizeof(Compare)+4*sys.getsizeof(N)+2*sys.getsizeof(Count)
fileout.writelines(str(Count)+"\n")
fileout.seek(fileout.tell())
t2=time.clock()
fileout.write("Time:"+str(t2-t1)+"\n")
fileout.write("Comparison:"+str(Compare)+"\n")
fileout.write("Memory:"+str(mem)+"\n")