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=float(n*y/100-x)

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

	 		  	 	    			 					    		 		