import sys

line = sys.stdin.readline()
data = line.split()
data = [int(d) for d in data]

n = data[0]
wizards = data[1]
percent = data[2]

current_percent = float(wizards)/n
clones = 0

while(current_percent*100 < percent):
    clones += 1
    current_percent = float(wizards+clones)/n

print clones

 	 				     	 	   		  	  		  	