#(2^((2^(115-1))-1))*(2-(2^-4294967180))
from decimal import *
getcontext().prec = 100
from decimal import localcontext
with localcontext() as ctx:
    print(ctx.Emax) # デフォルトの指数上限は999999なので、今回の計算だと足りない
    ctx.Emax = 999999999999999999999999999999999999 # 指数上限を増やす
    s = ctx.power(2,20769187434139310514121985316880383)
    print(s)
    w = ctx.power(2,-4294967180)
    print(w)
    t = (s * 2 - s * w)
    print(t)
    #必要に応じて有効桁を調整する
    format_str = "{:.1e}".format(t)
    print(format_str)
 

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