문제
A*B를 계산하다 지겨워진 형택이는 A*B를 새로운 방법으로 정의하려고 한다.
A에서 한 자리를 뽑고 * B에서 임의로 한 자리를 뽑아 곱한다.
의 가능한 모든 조합 (A가 n자리, B가 m자리 수라면 총 가능한 조합은 n*m개)을 더한 수로 정의하려고 한다.
예를 들어 121*34는
1*3 + 1*4 + 2*3 + 2*4 + 1*3 + 1*4 = 28
이 된다. 이러한 형택이의 곱셈 결과를 구하는 프로그램을 작성하시오.
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