import math
n, x, y = map(int, input().split())
percentage = math.ceil(n * y / 100)
if x < percentage:
print(percentage - x)
else:
print(0)
#include <iostream>
using namespace std;
int main()
{
int n, x, y;
cin >> n >> x >> y;
int clones = (n * y + 99) / 100 - x;
if (clones < 0)
{
clones = 0;
}
cout << clones << endl;
return 0;
}
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