JSFiddle - React, Tailwind, and code Playground

HTML

Начислить: 	<input type="text" name="Money" id="plsmns" class="AllMoney"/><button onclick="javascript:sumInputs()">Sum</button><br>
<br><br>

Денег: <input type="text" class="AllMoney" name="Money" id="TotalMoney" readonly/>

JavaScript

window.sumInputs = function() {
    var moneyin = document.getElementsByClassName('AllMoney'),
        result = document.getElementById('TotalMoney'),
        sum = 0;            
    
    for(var i=0; i<moneyin.length; i++) {
        var ip = moneyin[i];
    
        if (ip.name && ip.name.indexOf("TotalMoney") < 0) {
            sum += parseInt(ip.value) || 0;
        }
    
    }
    
    result.value = sum;
}