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#include <stdio.h>
#include <stdlib.h>
typedef unsigned uint;
static uint sum;
static void meta(void) {
uint meta;
scanf("%u", &meta);
sum += meta;
}
static void node(void) {
uint nchild, nmeta;
scanf("%u %u", &nchild, &nmeta);
for (uint i = 0; i < nchild; ++i) {
node();
}
for (uint i = 0; i < nmeta; ++i) {
meta();
}
}
int main() {
node();
printf("%u\n", sum);
}
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