The Devil and the Man play a game. Initially, the Man pays some cash $s$ to the Devil. Then he lists some $97$ triples $\{i,j,k\}$ consisting of positive integers not exceeding $100$. After that, the Devil draws some convex polygon $A_1A_2...A_{100}$ with area $100$ and pays to the Man, the sum of areas of all triangles $A_iA_jA_k$. Determine the maximal value of $s$ which guarantees that the Man receives at least as much cash as he paid.

[i]Proposed by Nikolai Beluhov, Bulgaria[/i]
To determine the maximal value of \( s \) which guarantees that the Man receives at least as much cash as he paid, we need to analyze the sum of the areas of all triangles \( A_iA_jA_k \) formed by the vertices of the convex polygon \( A_1A_2\ldots A_{100} \).

1. **Understanding the Problem:**
   - The Man lists 97 triples \(\{i,j,k\}\) where \(1 \leq i, j, k \leq 100\).
   - The Devil draws a convex polygon \(A_1A_2\ldots A_{100}\) with area 100.
   - The Devil pays the Man the sum of the areas of the triangles \(A_iA_jA_k\) for the listed triples.

2. **Key Insight:**
   - The sum of the areas of all possible triangles formed by the vertices of a convex polygon is a known combinatorial geometry result.
   - For a convex polygon with \( n \) vertices and total area \( A \), the sum of the areas of all possible triangles is given by:
     \[
     \sum_{\{i,j,k\}} \text{Area}(A_iA_jA_k) = \binom{n}{3} \cdot \frac{A}{n-2}
     \]
   - For \( n = 100 \) and \( A = 100 \):
     \[
     \sum_{\{i,j,k\}} \text{Area}(A_iA_jA_k) = \binom{100}{3} \cdot \frac{100}{98}
     \]

3. **Calculation:**
   - Calculate \(\binom{100}{3}\):
     \[
     \binom{100}{3} = \frac{100 \cdot 99 \cdot 98}{3 \cdot 2 \cdot 1} = 161700
     \]
   - Therefore, the sum of the areas of all possible triangles is:
     \[
     161700 \cdot \frac{100}{98} = 161700 \cdot \frac{50}{49} = 165000
     \]

4. **Considering Only 97 Triples:**
   - The Man lists only 97 triples out of the possible \(\binom{100}{3}\) triples.
   - The maximum sum of the areas of these 97 triangles cannot exceed the total area of the polygon, which is 100.

5. **Conclusion:**
   - Since the sum of the areas of the 97 triangles is at most 100, the Man cannot guarantee receiving more than he paid unless \( s \leq 0 \).
   - Therefore, the maximal value of \( s \) that guarantees the Man receives at least as much cash as he paid is \( 0 \).

\(\blacksquare\)

The final answer is \( \boxed{ 0 } \).