dataGridView1.Rows[4].Cells[1].Value = (int)double.Parse(dataGridView1.Rows[0].Cells[1].EditedFormattedValue.ToString()) +double.Parse(dataGridView1.Rows[1].Cells[1].EditedFormattedValue.ToString()) +double.Parse(dataGridView1.Rows[2].Cells[1].EditedFormattedValue.ToString()) +double.Parse(dataGridView1.Rows[3].Cells[1].EditedFormattedValue.ToString());
var
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