#include<stdio.h>

int main()
{
    long long x,temp;
    double n,y;
    while(scanf("%lf %lld %lf",&n,&x,&y)==3)
    {
        temp=ceil((n*y)/100);
        //printf("%lld\n",temp);
        printf("%lld\n",temp-x);
    }
    return 0;
}
