import math
tokens=raw_input().split(" ")
n=int(tokens[0])#n=int(input('n'))
x=int(tokens[1])#x=int(input('x'))
y=int(tokens[2])#y=int(input('y'))

needed=n*y/100-x

if needed>0:
    if needed==int(needed):
        print int(needed)
    else:
        print int(needed+1)
else:
    print '0'

  		 	  			 		   	 	 			 		 	 	