#author kymo
[n,x,y] = [int(i) for i in raw_input().split()]
st = float(n * y) / float(100)
ts = int(st)  
if ts >= x:
    if ts == st:
        ans = ts - x
    else:
        ans = ts + 1 - x
else:
    ans = 0
print ans


    
