auto update README.md

README.md

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 |1427. 소트인사이드|[링크](./%EB%B0%B1%EC%A4%80/Silver/1427.%E2%80%85%EC%86%8C%ED%8A%B8%EC%9D%B8%EC%82%AC%EC%9D%B4%EB%93%9C/README.md)|
 |17219. 비밀번호 찾기|[링크](./%EB%B0%B1%EC%A4%80/Silver/17219.%E2%80%85%EB%B9%84%EB%B0%80%EB%B2%88%ED%98%B8%E2%80%85%EC%B0%BE%EA%B8%B0/README.md)|
 |1764. 듣보잡|[링크](./%EB%B0%B1%EC%A4%80/Silver/1764.%E2%80%85%EB%93%A3%EB%B3%B4%EC%9E%A1/%EB%93%A3%EB%B3%B4%EC%9E%A1.py)|
+|1789. 수들의 합|[링크](./%EB%B0%B1%EC%A4%80/Silver/1789.%E2%80%85%EC%88%98%EB%93%A4%EC%9D%98%E2%80%85%ED%95%A9/%EC%88%98%EB%93%A4%EC%9D%98%E2%80%85%ED%95%A9.py)|
 |1920. 수 찾기|[링크](./%EB%B0%B1%EC%A4%80/Silver/1920.%E2%80%85%EC%88%98%E2%80%85%EC%B0%BE%EA%B8%B0/README.md)|
 |2164. 카드2|[링크](./%EB%B0%B1%EC%A4%80/Silver/2164.%E2%80%85%EC%B9%B4%EB%93%9C2/%EC%B9%B4%EB%93%9C2.py)|
 |2751. 수 정렬하기 2|[링크](./%EB%B0%B1%EC%A4%80/Silver/2751.%E2%80%85%EC%88%98%E2%80%85%EC%A0%95%EB%A0%AC%ED%95%98%EA%B8%B0%E2%80%852/%EC%88%98%E2%80%85%EC%A0%95%EB%A0%AC%ED%95%98%EA%B8%B0%E2%80%852.py)|