import macros proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "" .} proc scan(): int = while true: let k = getchar_unlocked() if k < '0': return result = 10 * result + k.ord - '0'.ord proc putchar_unlocked(c:char){. importc:"putchar_unlocked",header: "" .} proc printInt(a0:int32) = template div10(a:int32) : int32 = cast[int32]((0x1999999A * cast[int64](a)) shr 32) template put(n:int32) = putchar_unlocked("0123456789"[n]) proc getPrintIntNimCode(n,maxA:static[int32]):string = result = "if a0 < " & $maxA & ":\n" for i in 1..n: result &= " let a" & $i & " = a" & $(i-1) & ".div10\n" result &= " put(a" & $n & ")\n" for i in n.countdown(1): result &= " put(a" & $(i-1) & "-a" & $i & "*10)\n" result &= " return" macro eval(s:static[string]): auto = parseStmt(s) eval(getPrintIntNimCode(0,10)) eval(getPrintIntNimCode(1,100)) eval(getPrintIntNimCode(2,1000)) eval(getPrintIntNimCode(3,10000)) eval(getPrintIntNimCode(4,100000)) eval(getPrintIntNimCode(5,1000000)) eval(getPrintIntNimCode(6,10000000)) eval(getPrintIntNimCode(7,100000000)) eval(getPrintIntNimCode(8,1000000000)) let w = scan() let dMax = scan() var left = w for d in countdown(dMax,0): if d == 1: printInt(left.int32) quit 0 left -= left div (d * d)