line=raw_input()
number=line.split()
num=[]
for i in number:
    num.append(int(i))

people=num[0]*num[2]/100-num[1]

if people<=0:
    print 0
else:
    if people%1!=0:
        print int(people)+1
    else:
        print int(people)
		 	  			  			 	 	 	   	 	    	