function solve(input) {
    let transactions=Number(input.shift());
    let totalSum=0;
    for(let i=0; i<transactions; i++){
        let sum=Number(input.shift());
        if(sum<0){
            console.log("Invalid operation!");
            break;
        }
        console.log(`Increase: ${sum.toFixed(2)}`);
        totalSum+=sum;

    }console.log(`Total: ${totalSum.toFixed(2)}`);

}