What insulation R-value?

What R-value should I use in my attic, I will be using the cellulose blow in. I live in Missouri and summers & winters can get pretty warm/cold. I live in a ranch home 2000sq ft on a slab with 3ton electric heat w/ heat pump. Well just give me so info thanks

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Tagged as: amp, cellulose, electric heat, heat pump, info thanks, slab, warm cold