#include <stdio.h>

int add_metadata() {
	int nc, nd, d, i, sum;
	sum = 0;
	if (scanf("%d %d", &nc, &nd) == 2) {
		for (i = 0; i < nc; ++i) {
			sum += add_metadata();
		}
		for (i = 0; i < nd; ++i) {
			if (scanf("%d", &d) == 1) {
			       sum += d;
		      	}
	 	}
	}
	return sum;
}

int main(int argc, char *argv[]) {
	printf("%d\n", add_metadata());
	return 0;
}