c=raw_input()
p=c.split()
num=[]
for i in p:
    num.append(int(i))

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

if y<num[1]:
    print 0
else:
    if y%1==0:
        print int(y)
    else:
        print int(y)+1

	   			 	  		 	 			 	 		 			 	