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

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

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

    else:
        print int(people)+1

 		   			  			 	 	  	  	  		