#include <bits/stdc++.h>
using namespace std;

int main()
{
    long long A, B;
    cin >> A >> B;
    cout << A * 1.0 * B / 100 << endl;
}

#include <bits/stdc++.h>
#define int long long
using namespace std;

inline int read(){
    int s=0,w=1;
    char ch=getchar();
    while(ch<'0'||ch>'9'){
        if(ch=='-')w=-1;ch=getchar();
    }
    while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
    return s*w;
}

inline bool read(int& a){
    int s=0,w=1;
    char ch=getchar();
    if(ch==EOF){
        return false;
    }
    while(ch<'0'||ch>'9'){
        if(ch=='-')w=-1;ch=getchar();
    }
    while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
    a=s*w;
    return true;
}

inline void write(int x){
    if(x<0) putchar('-'),x=-x;
    if(x>9) write(x/10);
    putchar(x%10+'0');
}

template<typename...args>inline bool read(int &a,args&...x){
    return (read(a),read(x...));
}

inline void writeln(int x){
    if(x<0) putchar('-'),x=-x;
    if(x>9) write(x/10);
    putchar(x%10+'0');
    puts("");
}

int a,b,c,d;

signed main(){
    read(a,b,c,d);
    writeln(b-c);
    return 0;
}