Calculation error

[Yelay12]

local input=gg.prompt({"input first value။"},{"9223372036854775000"})
local input1=gg.prompt({"input second value။"})
mpy = tonumber(input[1]) * tonumber(input1[1])
gg.alert('result; "'..mpy..'" ', 'copy')
gg.copyText(mpy)

[CmP]

Make first operand floating-point by multiplying 1.0 by it, that way all calculations will be with floating-point values and you will get approximate result.

mpy = 1.0 * tonumber(input[1]) * tonumber(input1[1])

[Yelay12]

when i multiply value so big.Result is wrong.Please help me what is wrong result.