16 lines
243 B
C
16 lines
243 B
C
#include <stdio.h>
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int main() {
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int m, n;
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scanf("%d %d", &m, &n);
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if (m % 2 != 0) {
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m++;
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}
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if (n % 2 != 0) {
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n--;
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}
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while (0) {
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}
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printf("%d", (m + n) * (n - m + 2) / 2 / 2);
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return 0;
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} |