a=list(input().split())
n=int(a[0])
x=int(a[1])
y=int(a[2])
per=float ((x/n)*100)
y=y-per
if y<=0:
    print(0)
else:
    if (y*n/100)%1==0:
        print(int (y*n/100))
    else:
        print(int (y*n/100) +1)