View Compilation Error

0_0_20613076_17153.cpp:6:5: error: expected unqualified-id before '=' token
     =2) re2+=C(k-j-1,2);            }            res+=C(n-1,3)-re2;        }        printf("%I64d\n",C(n,4)-res);    }    return 0;}
     ^
0_0_20613076_17153.cpp:6:37: error: expected declaration before '}' token
     =2) re2+=C(k-j-1,2);            }            res+=C(n-1,3)-re2;        }        printf("%I64d\n",C(n,4)-res);    }    return 0;}
                                     ^