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#include <iostream>

int MCD(int A, int B){
    if (B==0){
        return A;
    }else if (A==0){
        return B;
    }else{
        if (A<B){
            return MCD(A,B%A);
        }else{
            return MCD(B,A%B);
        }
    }
}


int main()
{
    int res=MCD(5,15);
    printf("El MCD es: %d",res);
    return 0;
}