Assume that the complete combustion of one mole of glucose to carbon dioxide and water liberates 2870 kJ/mol (?G°' = –2870 kJ/mol). If one contraction cycle in muscle requires 63 kJ, and the energy from the combustion of glucose is converted with an efficiency of 39% to contraction, how many contraction cycles could theoretically be fueled by the complete combustion of one mole of glucose? Round your answer to the nearest whole number.