var n, r, i: integer; begin readln(n); r := 0; for i := 1 to 7 do r := r + 2*i*n; write(r) end.
var m, n, i: integer; k : real; begin readln(m,n); k := 1; for i := 0 to 10 do k := k * ((m+i)/(n+i)); write(k) end.