WA 20pts求助qwq

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define i128 __int128
#define lid (id << 1)
#define rid (id << 1 | 1)
const int N = 5e2+5, M = 1e3+5;
namespace io {
    #define fastio ios::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr)
    const int SIZE = (1 << 21) + 1;
    char ibuf[SIZE], *iS, *iT, obuf[SIZE], *oS = obuf, *oT = oS + SIZE - 1, c, qu[55]; int f, qr;
//    #define gc() (iS == iT ? (iT = (iS = ibuf) + fread (ibuf, 1, SIZE, stdin), (iS == iT ? EOF : *iS ++)) : *iS ++)
    #define gc() getchar() 
    inline void flush () { fwrite (obuf, 1, oS - obuf, stdout); oS = obuf; }
    inline void putc (char x) { *oS ++ = x; if (oS == oT) flush (); }
    template <class I> inline void read(I &x){ for (f = 1, c = gc(); c < '0' || c > '9'; c = gc()) if (c == '-') f = -1; for (x = 0; c <= '9' && c >= '0'; c = gc()) x = x * 10 + (c & 15); x *= f; }
    template <class I> inline void write(I x) { if (!x) putc ('0'); if (x < 0) putc ('-'), x = -x; while (x) qu[++ qr] = x % 10 + '0',  x /= 10; while (qr) putc (qu[qr --]); }
    struct Flusher_ {~Flusher_(){flush();}}io_flusher_;
}
using io::read;
using io::write;
using io::putc;
namespace tianyu{
    int a, b;
    void awa(){
        cin >> a >> b;
        int c = a + b;
        cout << b + (b - a) * a / 10;
    }
}
signed main(){ 
    fastio;
    int T = 1;
    while (T--){
        tianyu::awa();
    }
    return 0;
}