((1994+1993*1995)/(1994*1995-1))+((1995+1994*1996)/(1995*1996-1))+((1996+1995*1997)/(1996*1997- 1))+((1997+1996*1998)/(1997*1998-1)).
((1994+1993*1995)/(1994*1995-1))+((1995+1994*1996)/(1995*1996-1))+((1996+1995*1997)/(1996*1997-1))+((1997+1996*1998)/(1997*1998-1))．
<gadget id="calculator">1_993 * 1_995</gadget>
<output>3_976_035</output>

<gadget id="calculator">1_994 + 3_976_035</gadget>
<output>3_978_029</output>

<gadget id="calculator">1_993 + 1</gadget>
<output>1_994</output>

<gadget id="calculator">1_994 * 1_995</gadget>
<output>3_978_030</output>

<gadget id="calculator">3_978_030 - 1</gadget>
<output>3_978_029</output>

<gadget id="calculator">3_978_029 / 3_978_029</gadget>
<output>1</output>

<gadget id="calculator">1_994 * 1_996</gadget>
<output>3_980_024</output>

<gadget id="calculator">1_995 + 3_980_024</gadget>
<output>3_982_019</output>

<gadget id="calculator">1_994 + 1</gadget>
<output>1_995</output>

<gadget id="calculator">1_995 * 1_996</gadget>
<output>3_982_020</output>

<gadget id="calculator">3_982_020 - 1</gadget>
<output>3_982_019</output>

<gadget id="calculator">3_982_019 / 3_982_019</gadget>
<output>1</output>

<gadget id="calculator">1_995 * 1_997</gadget>
<output>3_984_015</output>

<gadget id="calculator">1_996 + 3_984_015</gadget>
<output>3_986_011</output>

<gadget id="calculator">1_995 + 1</gadget>
<output>1_996</output>

<gadget id="calculator">1_996 * 1_997</gadget>
<output>3_986_012</output>

<gadget id="calculator">3_986_012 - 1</gadget>
<output>3_986_011</output>

<gadget id="calculator">3_986_011 / 3_986_011</gadget>
<output>1</output>

<gadget id="calculator">1_996 * 1_998</gadget>
<output>3_988_008</output>

<gadget id="calculator">1_997 + 3_988_008</gadget>
<output>3_990_005</output>

<gadget id="calculator">1_996 + 1</gadget>
<output>1_997</output>

<gadget id="calculator">1_997 * 1_998</gadget>
<output>3_990_006</output>

<gadget id="calculator">3_990_006 - 1</gadget>
<output>3_990_005</output>

<gadget id="calculator">3_990_005 / 3_990_005</gadget>
<output>1</output>

<gadget id="calculator">1 + 1 + 1 + 1</gadget>
<output>4</output>

<result>4</result>