Consider the following C program carefully. What will be printed on the screen when this program is compiled and executed?

#include <stdio.h>
int main() {
    int k = 2, s = 0;
    switch (k) {
        case 1: s += 1;
        case 2: s += 10;
        case 3: s += 100;
            break;
        case 4: s += 1000;
    }
    printf("%d", s);
    return 0;
}