#include <stdio.h> 
int main() { 
    int x, y, z, count = 0;
    puts("***************************************************");
    puts("*  This program is to solve an interesting math question in  *");
    puts("*                  Karl Marx's manuscript.                  *");
    puts("*  The Problem is as follows: 30 persons spent 50 yuan in a  *");
    puts("*  restaurant, among them, each man spent 3 yuan, each woman *");
    puts("*  spent 2 yuan, and each child spent 1 yuan. The question is *");
    puts("*  how many men, women and children are there?               *");
    puts("***************************************************");
    puts(" >> The solutions are:");
    printf("   No.     Men     Women   Children\n");
    printf("---------------------------------------\n");
    for (x = 0; x <= 10; x++) {
        y = 20 - 2 * x;
        z = 30 - x - y;
        if (3 * x + 2 * y + z == 50 && y >= 0 && z >= 0) {
            printf("  <%2d>    %2d      %2d       %2d\n", ++count, x, y, z);
        }
    }
    printf("---------------------------------------\n");
    printf(" Press Enter to quit...");
    getchar();
    return 0;
}