#include <stdio.h>

int main()
{
    int a;
    int b;

    a = 10;
    b = 20;

    printf("%d + %d = %d \n", a, b, a+b);
    int c;
    int d;
    c = 30;
    d = 40;
    printf("%d + %d = %d \n", c, d, c+d);

    return 0;
}