Friends+friends * Yuan+Night Festival+Good * Small = 619+2 * 7+6 *1+8 * 4 = 61.
Friends * Yuan+Night * Festival+Good * Small+Friends = 611* 2+5 * 8+2 * 6+7 = 61.
Yuan * Xiao+Jie * Hao * Xiao+Friend = 617 * 2+4 * 9 *1+6+5 = 61.
Night Festival+Good * Small * Friends+Friends-Yuan = 612 * 4+9 *1* 6+7-8 = 61.
Jie * Hao * Xiao+Peng * You+Yuan * Xiao = 614 * 7 *1+3 * 9+8 * 2 = 61.
Good * small * friends+friends-yuan+night * festival = 619 *1* 6+7-8+2 * 4 = 61.
Principle: Set an unknown number.